Which factors were determined to directly cause the loss of skin pigmentation in humans as a result of natural selection? (1 point)

1. a change in the diet of human populations as they settled in colder climates

2. the clothing worn by humans in the early 8th century

3.the interaction of human populations with predators in colder climates

4.the impact of UV radiation on folate and Vitamin D levels in human populations

what subject is this

on the planet jupiter, the acceleration due to gravity is approximately 26 m s2 , roughly 2.7 times the acceleration due

i think the answer is b.

the dna molecules have a negative charge because of the phosphate groups in their sugar-phosphate backbone, so they start moving through the matrix of the gel towards the positive pole. power is turned on and dna fragments migrate through gel (towards the positive electrode).

explanation: