Answer:
Option (e).
Explanation:
The two main types of immune cells are B-cells and T-cells. B cells are antibody producing cells where as T cells are antigen presenting cells.
A scientist claimed that a new blood borne virus can be indestructible by CD8+ cytotoxic T cells and kills many cells. But the medical community quickly denounces the warning as irrelevant because only CD8+ cells are not the only cells that are capable of removing viral infection. Natural killer cells are also involved in virus killing. The blood borne virus can not kill million cells as they are involved in the difficult mode of transmission.
Thus, the correct answer is option (E).
They change into pupae for most of winter
It can helps us to keep the human body healthy and continue to discover how to keep it healthy, and what keeps it healthy. The study of biology can lead to discovering how to prevent diseases. In the environment, if something is off, then people can use biology to see what is wrong and how to fix it.
The answer is B The new cell will have from each parent