question below:
Which best describes two organ systems working together to help maintain homeostasis?
answer below:
The muscles of the chest tighten to push carbon dioxide out of the lungs.

question below:
Which is a chemical change?
answer below:
Element 3 turns a greenish color as it sits in air.

question below:
All animals need food to survive. Immediately after an animal eats food, the food is
answer below:
digested into simpler substances

question below:
Which cell structure carries out a function for a cell that is similar to the function that bark carries out for a tree?
answer below:
cell wall