When a human embryo develops, it produces a special type of hemoglobin not found in infant, child, or adult blood. Which statement best explains how an embryo can produce a different type of hemoglobin from that of an infant, a child, or an adult?

A.) Humans have genes for different types of hemoglobin, and they are expressed at different times.

B.) Human genes change slowly as a person ages.

C.) An embryo and an adult have different genes for hemoglobin.

D.) As the embryo develops and cells differentiate, certain genes are lost.

answer: - b cells

explanation: -

there are many types of white blood cells present in our body. one such class of white blood cells are the lymphocytes. the b cells belong to the lymphocyte class of wbcs. the b cells perform their action against the pathogen by producing specialised proteins called as antibodies. these antibodies are produced as and when the b cells encounter pathogens in response to the antigens present on the surface of the pathogen. these antibodies bind to the antigens present on the pathogen and then, target them for destruction by other cells of the immune system.

so, the b cells mediate their action by identifying the antigens present on the surface of the pathogens and then producing antibodies in return to mediate its effect.

Ithink a saturated phospholipid