Biology, 30.06.2019 23:00 jessie6516
Assume that you have chosen to research a topic for your biology class and you have become interested in studying the abuse of performance-enhancing drugs by male athletes. the first thing you learn is that many athletes use anabolic-androgenic steroid hormones. males produce one called testosterone, and an appropriate physiological concentration of testosterone keeps the production of sperm at nearly constant levels. you also learn that a consequence of injection of testosterone is suppression of sperm production. why do you suppose this is true? a. excess testosterone inhibits the activity of lh and fsh, neither of which is needed for sperm production. b. the excess testosterone can feed back and inhibit certain steps in spermatogenesis, resulting in lowered sperm counts. c. excess testosterone initiates the formation of diploid sperm. d. excess testosterone causes the release of more gnrh.
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Biology, 22.06.2019 15:00, Robinlynn228
The color of the fur is the genotypephenotype. the genetic combination of alleles that determine the fur color is called the genotypephenotype.
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Biology, 22.06.2019 15:30, kittycatwaffels
Why are carbon dioxide concentrations expected to increase? a carbon dioxide concentrations are expected to increase, because fossil fuel burning is expected to increase b. carbon dioxide concentrations are expected to increase, because of an increase in agriculture. c. carbon dioxide concentrations are expected to increase, because more land will have to be cleared for increasing populations and agricultural use. d. all of the above select the best answer from the choices provided mark this and return save and exit next submit submit
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Biology, 22.06.2019 23:50, maggiekilgore1
30 points why are most volcanoes found around the ring of fire? this is a location where there are many hot spots. this is a location of numerous plate boundaries. this is a location within an active oceanic plate. this is a location of fast moving continental crust.
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Assume that you have chosen to research a topic for your biology class and you have become intereste...
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