Because an antibody is "made" relative to the antigen, but kept at low levels when you are exposed the first time ("primary immune response"). The second time you're exposed to the same antigen, memory cells recognize it and the body produces a high level of antibodies, and the level of antibodies usually remains higher for a longer time ("secondary immune response"). This is your basic immune response (primary and secondary).
This explains exactly why vaccines are effective to extremely effective.
Not all mixtures are solutions. It has to be a special homogeneous bond mixture composted of two or more substances
Answer: D, all are processes that shape Earth's features. I don't know if this was a choice answer but, hope this helps. :)
Explanation:
Both plants have separate tubular tissues like Xylem and Phloem to transport food, minerals, and water, right? Those are called the vascular plants. So for those that don't show this kind of differentiation of the tissue, they're called the non-vascular plants.
Water and the other nutrients just move through the plants' body, cell by cell. The plants can get water this way but only if the plants' body is no more than a few cells thick.
Answer:
B. Food and Drug Administration (FDA)
