norahramahi123
04.11.2020 •
Biology
Environmental factors can cause various changes in ecosystems. Which of the following would most likely have the greatest lasting effect on an ecosystem?
a. a seasonal excess of fertilizer runoff
b. a disease among a population
c. change to the landscape from construction
d. seasonal drought
Please select the best answer from the choices provided A B C D
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Ответ:
The acquired or adaptive immunity requires white blood cells.
Explanation:
Acquired immunity acts by destroying the foreign particles with the help of white blood cell called lymphocytes. The lymphocytes – T cells and B cells activates the acquired immunity system.
The T-cells activates mediated immunity, where they directly destruct the problematic cells like tumor cells. This cell-mediated action is proceeded by different T cells – cytotoxic, suppressor, and helper T cells.
The B-cells activate humoral immunity by triggering antibody production against specific antigens and by signaling T cell activation. This antibody-mediated action is undertaken by plasma and memory B cells .