The relationships between a community of plants and animals and their environment are known as a

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

The law of thermodynamics states that energy can't be created or destroyed. to natural sources of energy on earth are the

Evolution acts upon the population of organisms and not on each individual organism