Answer:
Vitamin D is essential for strong bones,because it helps the body use calcium from the diet.
<span>It could lead to overfishing, since more fish have to be caught due to the high mortality rate.</span>
Explanation: because carry out all the functions in the human body necessary for living. Proteins make up hormones that are required for living. Insulin - responsible for stabilising blood sugar. Haemoglobin - responsible for carrying oxygen around the body. Melatonin - responsible for helping us get to sleep. Adrenalin - responsible for the flight-fight-freeze response. There are many more but here are just a few.
D. He controlled variables by studying one or two traits at a time
