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Question 1

What is xylem?

Question 2

This pack covered the human digestive system, from mouth to large intestine. What life process, involving oxygen, is covered next, in the following pack?

Question 3

Why do alveoli have such a large surface area, and thin, richly blood-supplied walls?

Question 4

What pigment absorbs sunlight energy for photosynthesis?

Question 5

Does aerobic respiration release more or less energy compared with anaerobic respiration?

Question 6

What substance in red blood cells actually binds with and carries oxygen?

Question 7

Do veins have thinner walls than arteries?

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