Answer:
B
Explanation:
proteins are used to repair muscle and make it stronger.
The process of making multiple copies of a gene by inserting it into a host genome and culturing the host is an example of gene cloning.
. It can lead to changes in allele frequencies and the evolution oftraits.
thymus plays important role by development of a normal, healthy immune system. thymus function is to generate mature lymphocytes
In other words, white blood cells that help fight of illness in the immune system.
sorry if I am wrong.