Which of the following provides long-term immunity? A. memory cells

B. cytotoxic T cells

C. complement proteins

D. antigens

Antigens is the correct ans

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hormones in blood stream

image: dtc.ucsf.edu

endocrine glands secrete hormones into the blood stream near them; the hormones then travel in our bloodstream until it reaches its destination, called a target cell, in distance parts of the body. in the target tissue, hormones lock onto the target’s plasma membrane, called the receptor site.

answer; i believe that the correct answer is ; males are hemizygous for the x chromosome;