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.
The answer is probably B because if you have a lot of prey it can feed more predators.
Answer:
Succulents
Explanation:
They have a thick waxy cuticle so that water vapour does not escape easily
Some have thornes so they are not eaten by animals
There roots are very wide and shallow so that they can absorb water from the surface quickly after it rains
Their stomata open at night so that too much water vapour cannot diffuse into the air
