Luca Cavalli-Sforza Hypothesizes That Skin Color Change Came Late Because

question 31

Multiple Choice

Luca Cavalli-Sforza hypothesizes that skin color change came late because:

• A) people used rudimentary umbrellas.
• B) earlier populations had ready access to vitamin D from the foods they ate.
• C) the Sun was not as powerful as it is today.
• D) people were still migrating from a cold cloudy environment to a sunny environment.

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Definitions:

Menstrual Period

A monthly cycle in which the lining of the womb (uterus) sheds, leading to bleeding through the vagina, part of the female reproductive cycle that prepares the body for pregnancy.

Zygote

Diploid cell resulting from the union of a sperm cell and an oocyte.

Identical Twins

Twins that develop from a single zygote splitting early in development, sharing 100% of their DNA.

Dizygotic

Pertaining to twins that develop from two different eggs fertilized by two different sperms, also known as fraternal twins.