Which two substances are among the six most abundant elements in living things?


A. Calcium
B. Nitrogen
C. Helium
D. Chlorine

Answer:

the answer is B. Nitrogen

Explanation:

The six most common elements in living things are carbon, hydrogen, oxygen, Nitrogen, phosphorus, and sulfur.

Dead ocean animals fall to the bottom of the ocean. A scientist notices rock layers that have formed on the ocean bottom with fossils of some of these animals. What type of rock is this?
PLS HELP

Which best describes the plate tectonic theory?

A) The Earth is a big puzzle
B) Broken plates of the Earth float on the liquid mantle

Which group of plants lacks true roots, stems, and leaves?

A seedless vascular plants
B nonvascular plants
C nonflowering seed plants
D flowering plants
This quetion is from edgenutiy

It is generally acknowledged that as human beings age, it becomes more difficult for them to lose weight, or even maintain their current weight. People find they have to eat less and/or exercise more to maintain a healthy weight.

Which is the most likely explanation of why weight loss/maintenance becomes more difficult as people age?

a). As humans age, they becomes less active and use their muscles less; therefore, less chemical energy is converted to thermal energy.
b). As humans age, the process of extracting energy from the food becomes less efficient, so more food is needed to provide the same amount of energy.
c). As humans age, they become injured more often and need to increase the amount of food they eat to make repairs to body tissue.
d). As humans age, the body does not convert chemical to thermal energy, so they do no burn off any calories when exercising.

Please hurry!

What type of element(s) would be expected to form first from a subatomic particle explosion? choices are heavy elements, iron, oxygen, and light elements!! thanks

Ezra eats a cheese sandwich for lunch. Cheese contains a lot of protein, and bread is mostly starch. Ezra plans to play basketball later in the afternoon. He is breathing normally.

What does Ezra need from the food he ate and the air he breathes so that he can play basketball? How do Ezra’s body systems work together to get the molecules he needs into his cells? How do his cells use these molecules to release energy for his body to run?

what is an outcome variable in an experiment?
Subject; science experiment

Which statement is not true of mitosis?

The statements are:

A There are four stages of mitosis

B It is the division of genetic material of a dividing eukaryotic cell into two parts

C it is a process that takes an average of eight minutes for any cell to complete the process

D each daughter cell receives a full set of chromosomes identical to the parent cell

The ____ is the source of all energy in our atmosphere. a. Sun c. Moon b. water cycle d. Coriolis effect

PLEASE HELP !!!

The following are the results of a cross between two pea plants where the dominant allele is round seeds and the recessive allele is wrinkled seeds: RR, RR, Rr, rr


What is the probability that the offspring of this cross has two dominant alleles?


0%

25%

50%

75%

100%

I need to summarize all of this...PLeAsE hElP mEeE!!!!!

ok here is a challenge i'll give you a brainiest if i agree!!
Let say we forget everything people has ever said to you such as ugly, pretty, short, tall, dumb or whatever that is "describing" you. (includes: family, friends, strangers)
now tell me who you "really" are after you forget everything anyone has ever said to you.

What sound does a cat make

Living organisms are made up of cells. Cells are organized at different levels to form very complex living organisms like your body. Each level has a specific role or job to perform.

Which of the following lists these levels in the correct order of organization from the simplest to the most complex?

Cells, tissues, organs, organ systems, organisms
⊝

Organisms, organ systems, organs, tissues, cells
⊝

Tissues, cells, organs, organisms, organ systems
⊝

Organs, organ systems, organisms, cells, tissues

Explain the connection between genes and your traits. Be sure to use the word protein.

Greek philosophers such as Democritus and Aristotle had ideas about the composition of matter. For example, Democritus believed matter was made of tiny, solid spheres that he called atomos, and Aristotle thought matter was made of earth, water, fire, and air. Aristotle's idea of matter was the accepted idea for over 2,000 years until John Dalton came up with a new theory about matter based on his experimental data. Which of the following best explains why Dalton’s theory became more widely-accepted over Aristotle's theory?


Aristotle’s theory did not have enough direct evidence due to poor observational tools.


Dalton’s theory had repeated observations which were supported by extensive evidence.


Dalton’s theory was more complete because more respected scientists found the ideas possible.


Aristotle’s theory became the law of conservation of mass when he documented phase changes of matter.

8. What is the difference between a unicellular organism and a multicellular organism?

What do osmosis and diffusion have in common?
A.) Both permit molecules of any kind, whether solute or solvent, to cross the bilayer membrane.
B.) Both require the additional energy provided by an energy carrying molecule, like ATP, to allow molecules to pass through the membrane.
C.) Both processes occur through a semipermeable membrane called a concentration gradient.
D.) Both are the net movement of randomly moving molecules that makes concentration nearly equal on both sides of a bilayer membrane.

How many total molecules are found in the following compound?

4K2CO3

1. Fill in the Punnett Square, showing the kinds of offspring (male or female) that are possible.
2. What is the genotype ratio for male and female offspring? __________
3. Is it more likely, less likely, or equally likely to produce boys instead of girls? ________

An astronomer wants to analyze the composition of a distant star. What is the best tool the astronomer can use?

just a sentence and nothing else