Human populations in low-UV environments tend to have more lightly pigmented skin. 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. lightly pigmented people 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. lightly pigmented people cannot synthesize vitamin D in high-UV environments, such as equatorial Africa d. indigenous peoples living at high latitudes have darker skin, but they eat foods rich in vitamin D

The correct answer from the provided option is D.

Explanation:

The evidence that supports the vitamin D hypothesis for the evolution of lighter skin tones is indigenous peoples living at high latitudes have darker skin, but they eat foods rich in vitamin D.

This shows that consuming food rich in Vitamin D is not the only factor that determine the skin color as indigenous people live in high latitude areas and consume food rich in vitamin D and still have darker skin.

answer: angiosperms

dicots

angiosperms are highly evolved plants, they produce seeds which are enclosed within in a carple. these are the largest group of plants on earth. they include trees, shrubs, herbs and small flowering plants. angiosperms exhibit a flowering stage in their life cycle. the flower serves the function of reproduction and fruit formation in majority of angiosperms. dicot is the term used to describe flowering plants that have two seed leaves. dicots are plants which develop seeds which split into two parts called cotyledons. each cotyledon contains one embryo.

here, a small purple flower development indicates that the plant belongs to angiosperms and having two embryonic leaves indicates it belongs to dicots.  

stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms