Answer:
Gold
Explanation:
Gold is a singular element according to the periodic table. (Labeled Au), and it does not result from chemical bonds or multiple elements, like all other items listed here do.
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Answer:
Fossil records provide evidence of an increase in animal species at the same time that atmospheric oxygen levels increased.
Explanation:
A huge diversification among animal species occurred with the increase in the levels of atmospheric oxygen. The reason why the number of species increased drastically was that a whole new world opened up, the land. The land was open for exploitation and taking over, with every single niche free, so animals diversified and filled in pretty much all of the niches. The fossil records give us clues when this happened, as from only microorganisms there is a sharp rise in complex animals, coinciding with the increase of oxygen levels.
If it wasn't for the increase of atmospheric oxygen though this wouldn't have been possible. The oxygen in the atmosphere enabled animals to breathe on land. Also, it cooled off the global temperatures which were too high before the increase of atmospheric oxygen, making them suitable for life. And last but not least, the atmospheric oxygen resulted in the formation of the ozone layer, a layer that started to act as protection from the UV rays.
Answer:
Option A, They have enzymatic properties that can covalently modify DNA.
Explanation:
Histones have very basic nature and possess no enzymatic properties. However, any modification of DNA is carried out after the end of translation process with the help of enzymes on the N –terminal tails through processes such methylation, acetylation, citrullination, phosphorylation.
There are several Histone-modifying enzymes in the human genome that interact with the non-histone proteins to form functional complexes
Hence, option A is correct
Under the directional selection, the genotype might change and the genotypes is the one that represent larger individuals become more prevalent. It might change, the Genotype frequencies under directional selection that the Genotypes that represent larger individuals become more prevalent. The answer in this question is the genotypes is the one that represent larger individuals become more prevalent.
Answer:
Explanation:
U might selectively breed cats for desired characterisitcs like having a cat with less fur or a cat with a certain type of colour.
