What is the importance if the carbon and nitrogen cycles to ecosystems

1 answer:

8 0

Carbon and nitrogen and an important element of living things. Nitrogen is a major component of DNA and amino acids while carbon can be found in almost all biomolecules. These elements, therefore, need to be renewed and recycled as they are utilized by ecosystems that is ever dynamic.

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DDT is an insecticide that was used extensively in the mid-1900s to kill mosquitoes. It was very effective at first, but after a

dlinn [17]

Insect populations can develop resistance to insecticides over time. The evolution of resistance is associated with an increase in the frequency of adaptive genes in the population.

In the case above described it is expected that a few mosquitoes in the population were resistant to DDT before it was ever used (Option a is correct).

Dichlorodiphenyltrichloroethane (DDT) is a pesticide used in agriculture.

After exposure to DDT, those individuals in the mosquito population that didn't carry gene variants (i.e., alleles) associated with the resistance to this pesticide died.

Subsequently, insects having adaptive alleles associated with DDT resistance survived and reproduced, thereby increasing the frequency of adaptive genes/alleles in the population.

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3 years ago

Is hepatitis B the most common bloodborne pathogen?

IrinaK [193]

Answer:

No.

Explanation:

Hepatitis C is the most common bloodborne pathogen.

Hepatitis C as of 2022 has a infection rate of 3.7 million.

Hepatitis B as of 2022 has a infection rate of 2.2 million, or <em>1.5 million</em> lower than Hepatitis C.