Biology, 08.10.2019 21:10, tahtahtw4887
Human populations in low-uv environments tend to have lighter skin tones. one explanation is that the selective pressure for dark skin decreases as uv intensity decreases. at the same time, there is selection for lighter skin to absorb more uv radiation, which is needed for vitamin d production. what evidence supports the vitamin d hypothesis for the evolution of lighter skin tones?
a. in general, people with lighter skin tend to be at higher risk of vitamin d deficiency. b. red hair and light skin are typical of people of northern european descent. c. some indigenous peoples living at high latitudes have darker skin, but they tend to eat foods rich in vitamin d. d. people with lighter skin cannot synthesize enough vitamin d in high-uv environments, such as equatorial africa.
Answers: 2
Biology, 22.06.2019 05:00, madiballet125
Asea turtle has washed up on a remote section of a beach. this known as a stranding occurs when a dead, sick or injured sea turtle washed up on the shoreline. which statment best explain why stranding should be reported immediately to local authorities
Answers: 1
Biology, 22.06.2019 10:30, nails4life324
In the desert, saguaro cacti, owls, horned lizards, and fire ants all share the same space. which of the following can be considered a population? question 9 options: all plants in the same area all cacti in the same area all species in the same area the lizards and the ants
Answers: 1
Human populations in low-uv environments tend to have lighter skin tones. one explanation is that th...
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