Xylem is composed by ,,,

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.

it's c. (to reduce the greenhouse effect/carbon gasses)

a. by using fur or clothes to trap heat energy near the body