Until the middle of the 20th century, doctors sometimes suggested that
people smoke in order to reduce stress. Since then, doctors have been asking
patients who smoke to quit.
What caused this change?
A. Studies have shown that tobacco and tar in cigarettes have
negative health effects.
B. Tobacco is an illegal drug, and doctors are required to discourage
its use.
C. Tobacco is a nonrenewable resource, and the government has
restricted its use.
D. Tobacco plants have been categorized as an endangered species,

Answer:

force

Explanation:

Force is as follows, strength or energy as an attribute of physical action or movement.  (ex of physical action. push or pull)

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The tool which is typically used for testing nitrates is: C. soil testing kit

Nitrogen is a chemical element with the symbol "N" and it has an atomic number (number of protons) of 7.

Basically, nitrogen is found in group (5) of the periodic table and as such it has 5 electrons in its outermost shell.

Oxygen is a chemical element with the symbol "O" and it has an atomic number (number of protons) of 8.

Generally, when nitrogen and oxygen react chemically, they produce a compound known as nitrogen dioxide.

In Chemistry, nitrates are chemical compound that comprises nitrogen and oxygen.

Also, nitrates are used in the production of soil fertilizers in agriculture.

In conclusion, a soil testing kit is mainly used to test the presence of nutrients such as nitrates in soils.

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The options are missing from the question,below are the options.

A) touch

B) smell

C) hearing

D) sight

The correct answer to the question is option D

SIGHT.

If one is experiencing Na channels deactivating the plasma membrane,the sense that is being activated is SIGHT,

this is because in the red blood cell,the light induced isomerization of the moiety retinal rhodoesin produce activated opsin which goes ahead to activate the signal transducing G-protein transducin,this it does by catalyzing exchange of GTP (Guanosine triphosphate) for bound GDP(guanosine diphosphate) on the subunit.

This GTP in turn activates the level of CGMP (Cyclic guanosine monophosphate) phosphodiesterase and it further acts to lower the level of CGMP.

Upon this reduction,it leads to the closing of CGMP-gated Na+ channels and hyperpolarization of the membrane.

Answer:

true

Explanation:

Answer:

True

Explanation:

it's true because

Answer:

f = 2.5 N right

Explanation:

Answer:

Option B) F = 2.5 N right

Answer:

d

Explanation:

Answer:

I think one is nitrogen. We have approximatly 78% of that in the atmosphere.

Another would be oxygen we have 21% of that.

We have argon and we have 0.93% of that.

Lastly we have carbon dioxide. And we have 0.04% of that.

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Answer:

Thomas is an English economist and demographer. He is best known for his theory that population growth will always tend to outrun the food supply and that betterment of humankind is impossible without stern limits on reproduction.

Explanation:

Answer:

1,4,5

Explanation:

true they depend on plants forco2

Answer:

No

Explanation:

Animals get Carbon dioxide from the air, and carbon dioxide is emitted by burning of fossil fuel

The group of choices is as follow:

A. RNA polymerase are added to the PCR mix to design random primers  

B. If detecting viral infection by PCR, the primers must not be complimentary (match) to regions of human DNA  

C. Pairs of primers must be designed, one to start amplification with Taq polymerase, the other to start amplification with human polymerase  

D. Primers are optional if you want to amplify all DNA within a sample

Answer:

The correct answer is - B. If detecting viral infection by PCR, the primers must be complementary to regions of human DNA.

Explanation:

Short, single-stranded segments of DNA sequences utilize in the real-time PCR or polymerase chain reaction technique are called primers. Primers used to hybridize the region of the segment needed to be amplified.

The human polymerase enzyme is not used in the PCR reaction and requires a 3'OH group to synthesize the DNA by amplification which is possible only in the presence of primers as they have a 3'OH.

Answer:

Some important constraints:  

-Plant breeding: autogamy and allogamy, self-sterility, etc  

-Animal breeding:  trait compatibility

- Breeding systems in general (i.e., both in plants and animals): barriers for sexual reproduction  

Explanation:

Crossbreeding systems consist of the breeding between two breeds in order to develop progeny with particular advantageous phenotypic traits. In-plant crossbreeding systems, it is imperative to have into account whether the plant is autogamous (reproducing by self-pollination) or allogamous (reproducing by cross-fertilization), because it will affect the fitness of the progeny resulting from these breeds. Moreover, the biological mechanisms of self sterility and compatibility must be also taken into consideration. In-animal breeding systems, it is important to have into consideration that phenotypic traits we desire to obtain in the progeny must be compatible between races. In addition, the barriers for sexual reproduction are also an important issue both in plant and animal breeding systems, it thus being impossible, for example, to get a breeding between Chihuahua and Great Dane dogs.

Answer:

fishes

Explanation:

A progenitor feature found in early boney fish served as the basis for the development of the vertebrate lung.

The lung of modern vertebrates evolved from a structure that was present in the ancestors of early boney fish.

Lungs in vertebrates originated as extra air-breathing organs in primordial fishes and were ventilated by buccal pumping when they first appeared. In more modern fishes, the organ formerly known as the lungs has been replaced with the hydrostatic swimbladder. This fundamental kind of unicameral lungs and the buccal pumping ventilation observed in these lungs can also be found in more modern amphibians.

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Answer:

A forest ecosystem is more stable than a potato field.

Explanation:

The forest ecosystem is a natural one and all the elements are balanced, they are managed by the nature itself.

The forest ecosystem is a natural one, and all the components are in harmony since nature herself manages the ecosystem.

Thus, A forest ecosystem, or simply a forest, is a community of plants, animals, microorganisms, and other species that interact with the chemical and physical elements of their environment.

The species in a forest ecosystem are depending on one another in order to survive, and they can be roughly categorized as producers, consumers, and decomposers based on their ecological roles.

The boreal forest that surrounds the Earth in northern latitudes is an example of a vast forest ecosystem. A forest ecosystem can also be as small as a microsite on a tree limb where mosses, insects, and microscopic species coexist.

Thus, The forest ecosystem is a natural one, and all the components are in harmony since nature herself manages the ecosystem.

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Answer:

membranes are semipermeable so only let certain materials in and out; if there are carrier or channel proteins, then passive transport can occur otherwise active transport is required which requires energy.

Explanation:

membranes are semipermeable so only let certain materials in and out; if there are carrier or channel proteins, then passive transport can occur otherwise active transport is required which requires energy.

Answer:

it was minato namikaze fatther of naruto and husband of the red hared woman and yes it was revealed in the show

Explanation:

Answer:

At convergent boundaries

Explanation:

"continental crust is created and oceanic crust is destroyed as it subducts, melts, and becomes magma."

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Answer:

The effects of added sugar intake: higher blood pressure, inflammation, weight gain, diabetes, and fatty liver disease... are all linked to an increased risk for heart attack and stroke.

Explanation: Hope this helps <3

Answer:

A disease that causes cells to grow too rapidly

Explanation:

The cancer has spread to another part of the body where there originally wasn't any cancer. Ex: If someone was diagnosed with thyroid cancer and then later they're told the cancer has spread to their lungs

Cancer  is characterized by abnormal cell growth when a cell does not divide naturally, it is said to have metastasized, which means that the cancer has spread from one part of the body to another.

It is a type of condition where the person's normal cell growth is hampered, and it has a significant impact on an individual, leading to a wide range of symptoms such as pain and fatigue and increasing mental health issues and an example of metastasis is the brain cancer can move to the lungs and other parts. Due to the significant advancements in the diagnosis and treatment of cancer, an earlier stage can be detected and the later stage can be somewhat cured.

Hence, cancer is characterized by abnormal cell growth when a cell does not divide naturally, it is said to have metastasized, which means that the cancer has spread from one part of the body to another.

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Answer:

The contaminated water contains harmful chemicals which results in the cracking of rock.

For example: The feldspar crystals within the granite react with the water chemically to form clay minerals which makes the rock weak and hence result in weathering.

Answer

Bioluminescence is a chemical reaction. It takes place inside the light-producing organ of a glowing creature. Fireflies, for example, make light in their abdomens. The chemical reaction produces energy in the form of photons.

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Answer: a plant with genotype rr will have red phenotype as the dominant, since there are two, same goes for ii, it will have ivory phenotype as the dominant. Meaning the one with ri would be of equal dominance. While the answer to the question on the bottom will be 1/2 or 50/100 chance of the pick one getting picked since, well, there is one of each plant, the possibility will have an equal chance of getting picked.

Explanation: hope this answers some of your questions.

Answer:

The scientific process is important when learning about diseases because it allows to obtain reliable and valid knowledge about the different existing diseases, it helps in solving problems correctly and it is the best tool to nullify arbitrary opinions regarding a diagnosis or treatment, taking into account each of its stages.

Explanation:

The scientific method is a process through which relationships between facts are established to arrive at the verification of something. Through this step by step in which facts are discarded and added, the answers to findings are based. It is through the information generated by the research that it is possible to associate and / or integrate a set of symptoms and signs with a probable nosological diagnosis. Similarly, the selection of treatment and even the prognosis of patients depend on the information obtained from a population of subjects who share attributes; they depend, in a word, on research. Bearing in mind the scientific process, scientific thinking develops with practice, and for this it is necessary that there be constant reflection on the problems, have guides for the interpretation of medical reading, develop research protocols, learn to collect and analyze data about diseases.

Scientific is very important in order to obtain information about the disease.

The scientific process is important when learning about diseases because it provides information about various aspects of diseases as well as provides solution about cure of the disease.

This scientific process or method can be used for obtaining information about the causes of disease, its causing agents and cure for the disease so we can conclude that scientific is very important in order to obtain information about the disease.

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Answer:

1. tissues

2. skin

3. connective tissues

4. brain

5. organ

6. taste buds

7. epithelial tissues

8. organ ssytems

9. organism

10. nerve tissues

Answer:

interphase

mitosis

Cytokinesis

Explanation:

three stages of the cell cycle interphase longest part of the cell cycle cell grows and develop and function Parts in our body almost at the end of the interphase DNA and chromosomes double mitosis stage in cell where cell divides into nuclei Cytokinesis the two daughter cells create as the cytoplasm divides each daughter cell has an exact copy of parent cells DNA

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Answer: the part where it says *eyecolor* man/woman ect. you choose an abbreviation for it i’m think and then for #3 you would put cb or sum for color blind on the top left, the left side on that same square, ncb for noncolor blind on the bottom square on the left, and ncb above the top right place, fill in the area labeled cb/cb with cb cb, the area under would have cb ncb, top right would be ncb cb n the one under would be nbc nbc (a) 25% (b) 25%

Explanation: