A vein always carries:a

blood to the heart.
b. blood from the heart.
c. oxygen-rich blood.
d. oxygen-poor blood.
e. blood rich in carbon dioxide.


a

Biology & Microbiology

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The allantois

A) destroys old blood cells. B) gives rise to the yolk sac. C) forms blood cells. D) is part of the placenta.

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If you moved plants from a desert-like white sand area north of Perth, Australia, to a moist-soiled forest south of Perth, what would probably happen?

A. The plants would probably do poorly since the two biomes are so different. B. The plants would probably become weeds. C. The plants would probably switch to asexual reproduction. D. The plants would probably find different pollinators. E. None of the answer choices is correct.

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Human blood is approximately 90% water

1.True 2.False

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Cells move to new positions as an embryo establishes its three germ-tissue layers during _____

A) determination B) cleavage C) induction D) gastrulation

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