The hormone erythropoietin acts to stimulate cells that are located in the ________ of an adult

A) spleen B) blood C) kidneys D) red bone marrow


Answer: D

Biology & Microbiology

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Nuclear pores permit the passage of all the following except: 

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Which factors besides sunlight influence the rate of primary productivity?

a. temperature and total number of organisms b. photosynthesis and availability of nutrients c. temperature and availability of water d. photosynthesis and availability of water e. temperature and photosynthesis

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Between which members of the chordate lineage do vertebrates arise?

1.between lungfishes and amphibians 2.between hagfishes and lampreys 3.just after the tunicates 4.between birds and mammals

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Which of the following characteristics would not favor delayed reproduction in a given species?

1.Individuals grow larger with age. 2.Larger size does not increase fecundity. 3.Mature individuals are likely to survive to old age. 4.Number of offspring produced increases with age.

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