CAN SOMONE CHECK IF MY ANSWER IS CORRECT THANKYOU! ILL ALSO MARK U AS BRAINLIEST

Explanation:

The answer is B.

That's : Red blood cells are flat and indented so they can carry the greatest possible amount of oxygen.

The answer you chose is incorrect, because it is the white blood cells which destroys infection.

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.

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.