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Plants alter their generations by switching between phases.
a. diploid and haploid
b. tetraploid and triploid

Plants alter their generations by switching between diploid and haploid phases.

Explanation:

The correct answer

white blood cells or wbc s are mainly 2 types-

1.agranulocytes

2.granulocytes

the monocytes or macrophages of agranulocytes , dendritic cells which are accessory leucocytes, and b cells which is one type of lymphocytes   identify the antigens present on the pathogen's surface. these three cells are called antigen presenting cells(apc) which are phagocytes and destroy the antigens by secreting antitoxins. besides this leukocyte is always plays vital role in the immunity of the body.

i think that d. wind is the answer.   i missed the question when i answered a. currents.