Which of the following cells is responsible for producing antibodies when antigens enter the body?

B lymphocytes produce antibodies - proteins (gamma globulins) that recognize foreign substances (antigen) and attach themselves to them. B lymphocytes (or B cells) are each programmed to make one specific antibody.

B (Cells)

Explanation:

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digestion

it excretes wastes

the answer is d p: cell, q: organ, r: organ system, s: tissue