Which of the following environmental changes is most difficult to survive? A. An annual rainy season
B. Cyclic temperature fluctuations
c. Cyclic sunlight fluctuations
D. A forest fire

Explain why phospholipid molecules form a bilayer. (3 marks)

As the human population grows, what happens to our natural-resource requirements? o they increase o they decrease o they do not change. they go in cycles

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