B, as the helper T cells need to recognise the antigens to know what they need to attack, and they activate cytotoxic T cells to destroy infected body cells.
Division of body cells results in a greater variety of traits
Answer:
The greenhouse effect is the way in which heat is trapped close to Earth's surface by “greenhouse gases.” These heat-trapping gases can be thought of as a blanket wrapped around Earth, keeping the planet toastier than it would be without them. Examples of gasses: Carbon dioxide, methane, and water vapor.
Explanation:
no problem.
Any living thing in there please so whether it is the trees or plants or animals anything that is living
