Answer:
<em>The correct option is cell surface markers.</em>
Explanation:
The immune cells of our body detect foreign particles and generate responses so that our body can get rid of them. The foreign particles are often termed as antigens.
The immune cells such as antibodies possess cell surface receptors which detect the foreign objects or antigens. When the cell surface receptors detect any antigen they immediately recognize that a foreign particle has invaded the body and they then identify it and start to generate response.
Yes. They do it to escape the winter. Hope it helps.
The homology of animals is based on scientists current understanding on the evolutionary history of living species.
Answer:
relationships among organisms and evolutionary relationships for organisms with a shared common ancestor.
