The source region in the pressure flow theory of phloem transport is most often the:
a. root
b. flower
c. stem
d. leaf
e. soil
d
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Which of the following genotypes is homozygous?
A) RR B) Rr C) RY D) Yy
Which organ systems are involved in thermoregulation by increased blood flow to the skin and by sweating?
A. circulatory and muscular B. muscular and integumentary C. endocrine and muscular D. circulatory and integumentary E. endocrine and circulatory
When a patch of land is cleared in a tropical rainforest, the vegetation is often burned to enrich the soil with nutrients from the burned plant material. What description applies to this situation?
A) This works well because so many nutrients are trapped in tropical plants. B) This works for a few years, but the soil is soon depleted of nutrients. C) This isn't necessary because tropical soils are filled with nutrients. D) This helps to promote long-term sustainable agriculture.
Which of these classes of biological molecules does NOT include polymers?
A) lipids B) carbohydrates C) proteins D) nucleic acids