The cardiovascular system is composed of the heart, blood vessels, and blood. Which is the best analogy to this system and its parts?

Most animal cell membranes have proteins that pump. ions out of the cell and potassium ions into this

Identify the structure in organisms that do not have kidneys that is adapted to regulate water balance

Once an egg cell is fertilized by sperm, the cell then, as the embryo develops, it receives nourishment and eliminates wastes by transferring substances from its blood to its mother's blood. a. becomes a fetus immediately and exits the womb b. begins to divide and implants itself in the wall of the uterus c. remains in the uterus without dividing for several months d. travels back to the ovaries until the fetus is developed