In addition to being necessary for respiration, also provides uv radiation protection.

a. water
(b.) carbon dioxide
c. oxygen
d. hydrogen

carbon dioxide?

How can antibodies "remember" a particular bacterial invader or "antigen" on that invader?

Which of the following are not included as modern mammals that evolved during the eocene epoch? primates artiodactyls perissodactyls none of the above

When a cell is in a solution that has the same concentration of water and solutes as its cytoplasm, the cell is said to be in a(n) solution. a. isotonic b. hypotonic c. hypertonic b. facilitated