The person should have his or her thyroid gland tested using a blood test of thyroid hormone levels to find out if the person has hypothyroidism.
Learn by looking at others do something
Endocrine and circulatory (C) Endocrine system consists of glands and the hormones they secrete whist the circulatory system is the blood or as I like to call the “transport system” of the body.
If you do not have variations to be selected by natural or sexual selection on their superior abilities to survive and reproduce successfully then nothing can be naturally selected against the immediate environment.
