Which of the following human activities directly destroys the habitats of marine life that live on the ocean floor?
A. ocean tourism
B. mining the ocean floor
C. shipping cargo over the ocean
D. commercial fishing with longlines
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b

Explanation:

because the animals live on the ocean floor

ability to bond woth oxygen

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.