Question: Choose your answer.

Which function do kidneys provide to maintain homeostasis?

OPTIONS:
- the removal of excess heat from the body
- the removal of carbon dioxide from the body
- the removal of excess oxygen from the blood
- the removal of nitrogenous wastes from the blood
My Answer: the removal of nitrogenous wastes from the blood

Question: Choose your answer.

Which type of organism would most likely benefit directly from increased levels of CO_{2}?

OPTIONS:
- fish
- bird
- tree
- mushroom
My Answer: tree

Question: Choose your answer.

Which cell can survive without the help of other cells?

OPTIONS:
- leaf cell
- yeast cell
- onion cell
- muscle cell
My Answer: yeast cell

Question: Choose your answer.

The atomic mass of an atom is

OPTIONS:
- the same as the atomic number.
- the same as the group number.
- the sum of protons and neutrons.
- the difference between protons and electrons.
My Answer:
the sum of protons and neutrons.