Answer:
The correct answers are C&D.
Explanation:
The helper T-cells are the part of the immune system that stimulates B cell multiplication. hope this helps! :)
Answer:
When you breathe in oxygen, your diaphragm pushes against itself and pulls downwards. The muscles between the ribs pull upwards. The oxygen gets into the tissues by being helped by red blood cells and has a pigment that collects four oxygen molecules. It forms into a thing known as oxyhaemoglobin and the molecules are taken to other singular cells in the body tissue, releasing its contents.
The correct answer is A
= 1.3 m/s^2; FN = 63.1 N
-Anonymous
geological isolation, if the birds that develop mutations do not have any competition they can survive.
