D. Use a condom during every sexual encounter
The tadpoles take their food from the yolk of an egg. The egg yolk is equivalent to the placenta. T<span>he </span>placenta <span>attaches itself to the uterus to provide the </span>developing<span> foetus with blood and oxygen.</span>
I think the answer would be B.
Answer:
<em>Antibodies attach to a specific antigen and make it easier for the immune cells to destroy the antigen. T lymphocytes attack antigens directly and help control the immune response. They also release chemicals, known as cytokines, which control the entire immune response</em><em>.</em>
