The CNS are lined by ependymal cells. Ependymal cells are epithelial cells that monitor the composition of cerebrospinal fluid (CSF)
Answer:
they breath in the o2 from the air and take it in through the stomata!
Explanation:
Answer:
controlled experiments
Explanation:
Experiments in which all variables are identical except for one are called controlled experiments. This where an observer tests his hypothesis by looking on changes that were brought about by one variable. The results are always dependent on one adjusted variable.
We can get amino acids from eating food that contain proteins.
Proteins are made up of chains of amino acids. During digestion, the proteins are broken down into amino acids.
