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Arteries are blood vessels that carry blood away from the heart. They have thicker walls than veins in order to cope with far higher blood pressure level...

Ask the student: what other option is there? What are the differences between the two? 

Answer: Humans have a small surface area to volume ratio, so diffusion alone is not enough to meet the high m...

VOSSAG V - Variation: all organisms undergo varying amounts of genetic variation due to genetic mutations or environmental factors (such as geographic separation). O - Overpopulation: all...

Phospholipids and proteins regulate the movement of substances through the membrane, thereby allowing the membrane to be selectively permeable. This is important since it allows the c...