Biology, 24.11.2020 01:00 trevorhenyan51
Why are surface antigens on sperm cells not recognized as “self,” and why do they require a blood-testis barrier to prevent antibody formation?
Answers: 1
Biology, 21.06.2019 21:00
Ausable water source is one that can be used by humans for drinking or agriculture. identify the water reservoirs as usable or unusable based on their current state. oceans rivers glaciers freshwater lakes groundwater
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Biology, 22.06.2019 07:00
In many humans, exposing the skin to sunlight over prolonged periods of time results in the production of more pigment by the skin cells (tanning). this change in skin color provides evidence that -
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Biology, 22.06.2019 10:00
Cladistics is a way of classifying organisms by examining the characteristics of their ancestors and descendants and depicting the relationships in a cladogram. which of the following best describes a challenge in classifying organisms this way? a. there are millions of species on earth, and a cladogram is not a practical means for classifying all of them. b. it is impossible to tell which organisms are most closely related to each other using a cladogram. c. cladograms are detail-oriented and do not provide a useful understanding of evolutionary relationships. d. there is a limited number of ways to organize the information, so most cladograms end up looking very similar.
Answers: 2
Why are surface antigens on sperm cells not recognized as “self,” and why do they require a blood-te...
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