A star is 20 pc away from us. Calculate its parallax angle.

Explanation:

distance to star i n parsecs=1/P.

Explanation:

1/0.25=4 Parsecs.enter image source here

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.