Answer:
The correct answer is: geography and UV radiation.
Explanation:
Skin variation occurred thanks to evolution, and was driven as a consequence of the geographical location of different populations of humans.
The humans that lived in hot and sunny places, closer to the equator, where much more exposed to the sun's ultraviolet radiation. In order to survive the amount of UV lights that they were exposed to, new humans in those regions were being born with a darker skin tone, which was rich in melanin (a brown pigment that protects us from the sun radiation).
Contrary to these humans that lived in the tropical areas, the humans that populated the areas that were closer to the poles, developed much lighter skin as a result of lower amounts of melanin in their skin. Since sun exposure in the poles is very limited, humans needed to receive as much as they could for the production of Vitamin D, and thus, their skins got lighter and less protected.
In guinea pigs, rough coat (R) is dominant over smooth coat (r). Predict the genotypes and phenotypes of the offspring and give the genotypic and phenotypic ratios is a homozygous dominant guinea pig is crossed with a heterozygous guinea pig. 3. ... In humans, brown eyes (B) are dominant over blue (b).
Answer:
C
Explanation:
Trees take up carbon dioxide from the atmosphere and reduce to make carbohydrates. This is powered by the energy of the sun that is taped by chlorophyll pigments during photosynthesis. The energy is used to split water molecules into H+ and O2-. Then the following chemical reaction ensues;
6CO2 + 6H2O ------> C6H12O6 + 6O2
Answer:
1. Adenine
2. Thymine
Explanation:
These are the four nitrogen bases of DNA nucleotides. It's just something that you have to memorize in order to be able to successfully study DNA. In case you are asked which base pairs with which, always remember this saying about base pairs: A and T, and, G and C.
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Yes, it’s main function is to protect the organisms from germs, bacteria etc... and cover the essential organs from these organisms too.