The loss of species on the daily basis is because of the human activities like deforestation, forest fires and exploitation of the species for their own use like overhunting, poaching, using animals resources like horns, teeth and other valuables.
The pollution can also be considered as an important factor for reduction of the species on the daily basis. Pollution may occur due to burning of the fossil fuels, discharge of sewage and other contaminants in the water. These activities are likely to kill the population of species to a number that population density of the species decrease, or the species may extinct.
Well, pollution is probably the main reason, but i think all of them are reasons why animals are dying off, if there isn't any choice for all of them, then your best bet would be to do a, pollution.
Answer: A dichotomous key is a tool that allows the user to determine the identity of items and organisms in the natural world. It is the most widely used form of classification in the biological sciences because it offers the user a quick and easy way of identifying unknown organisms.
DNA is a double stranded molecule. Covalent and hydrogen bonds pray important roles in the functioning of DNA molecules.
<em><u>Covalent bonds occur within each linear strand and strongly bond the nucleotide bases, sugars, and phosphate groups occurring both within each component and between components.</u></em>
<em><u> Hydrogen bonds occur between the two strands and involve a base from one strand with a base from the second in complementary pairing.</u></em>
Hydrogen bonds helps the complementary base pairs in DNA; guanine with cytosine and adenine with thymine to connect to one another. The hydrogen bonds between these complementary pairs helps keep the two strands of DNA helix together.
