Answer:
B- Are constantly replacing themselves,
Vitamins and minerals are important for body growth and brain development so it is important to make sure you were getting the recommended daily allowance of every type of vitamin and mineral from healthy foods such as fruits vegetables fish grains and dairy in order to ensure that your body is functioning at its maximum.
The answer is letter D.
When the body is experiencing stress it usually responds by producing additional enzymes in the liver and kidneys causing an increase in blood flow in these organs. Not only is stress visible on the outside but it clearly affects how the internal organs function within the body. Stress induces chemical reactions in the brain that trigger the response of the immune system of the body. The kidneys and the liver are part of the filtration and excretion of chemical processes that occur within the body that is why they are affected by stress hormones directly.
The answer is tighten and contract.
In order for the students to pull the rope their muscles will need to tighten and contract so they are able to continuously pull with all their strength and power. Relaxed or twitched muscles will result in release of the rope.
