Which of the following do animal cells need? Carbon dioxide
Photosynthesis
Oxygen
Cell walls

Animal cells need:

Oxygen.

this is because the cells use glucose and oxygen to produce yg p carbon dioxide, water, and energy.

the index of refraction of the second medium is higher. i just took the test trust me !

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.