The correct options are as follows: 1. Human skin color variation is primarily determined by the type and amount of melanin pigment in the skin. 2. Human skin color variation likely evolved in response to differences in the intensity of sunlight around the world. 3. Human skin color evolve recently in hominid evolution, once some population of human ancestor migrated out of Africa. The color of human skin is primarily determine by melanin. The intensity of the sun in the climate where one is living also affect the type of skin color that will dominate in a geographical area.
Over the millennia, the color of the skin of humans has adapted to the local sunshine.
A natural filter, melanin, has gradually developed under the influence of this selection pressure.
Melanin is a dark-colored pigment (from black to reddish brown) found in the skin, hair, hair and the membrane of the eye. The amount of melanin in an individual depends on several factors such as heredity, exposure of the skin to the sun (epigenetic factors) hormone levels or certain diseases.
Explanation: Left ventricle. With the thickest muscle mass of all the chambers, the left ventricle is the hardest pumping part of the heart, as it pumps blood that flows to the heart and rest of the body other than the lungs.
<h3>Hello there i hope you are having a good day :) Your question : In the human body, stem cells in the bone marrow produce a variety of blood cells. What process produces these cells? Answer : A. Undifferentiated cells divide to produce differentiated cells.</h3><h3>Hopefully that helps you ❤</h3>
