Answer:
carbon source Earth's crust
Answer:
D................... or B sorry
To the heart: pulmonary vein
Away from heart: pulmonary artery
Answer:
Self-antigens are not recognized and attacked by the T cells.
Explanation:
In immunology, the antigens are those substances which are bound by the antibodies. The antigens can be originated from within the bodies, known as self antigens or from outside the body, known as non-self antigens. The immune system identifies and attacks non-self invaders or the foreign harmful objects present in the body. It does not attack the self-antigens under the normal conditions. This is due to the negative selection of T cells of the thymus.
Hermit crabs and giant tritons have a commensalism type of relationship.
