Biology, 09.04.2020 05:13, angie249

why terrestrial trophic pyramids usually do not have levels higher than tertiary consumers?

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Biology, 22.06.2019 06:10, HOTaco1837

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Biology, 22.06.2019 13:10, mroueh21

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