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.
A. Males produce four functional sperm while females produce only one functional egg.
Answer:
Transphobia is a big one of course, but if she's family oriented, not being able to have a pregnancy and children of her own are a huge hit to the self esteem. I've also heard that the scarring from surgeries and dysphoria can make it unbearable at some points.
Explanation:
I have several trans friends, so it's always nice to spread information about these things when I can :)
Answer:
The skin surrounds the entire body just as the cell membrane surrounds the entire cell. Both the skin and the cell membrane are semi-permeable, meaning that they only allow specific substances to enter or exit the body.
The aorta is the largest artery in the body. The answer is that the aorta begins at the top of the left ventricle, the heart's muscular pumping chamber. The heart pumps blood from the left ventricle into the aorta through the aortic valve.
