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.

answer; a male inherits only one allele of the x-linked gene controlling hair color;

endo:

regulates body hormones, aldosterone, vasopressin

neural:

signal, regulates body using electric signals, reflex

endo has to do with hormones; aldosterone and vasopressin are both hormones. i also had this question and got it right : d