A baby's immune system is not fully developed until he/she is about six months-old. In the meantime, pregnant mothers pass immunoglobulin antibodies from their bloodstream, through the placenta, and to the fetus. These antibodies are an essential part of the fetus's immune system. They identify and bind to harmful substances, such as bacteria, viruses, and fungi that enter the body. This triggers other immune cells to destroy the foreign substance.
Answer:
the hormone that regulates the salt and water levels is aldosterone found on the adrenal gland that sits above the kidney
Explanation:
I believe its A because a bonds with t g bonds with c and c bonds with g, translated to rna it's UCG.
Thymine and cytosine are classified as "Pyrimidines" and have one ring of carbon and nitrogen atoms for each base.
