Ok on the first question I have no clue but on the second question of going to be the last answer white with a few grey
Answer:
Explanation:
A retrovirus is an RNA virus that is duplicated in a host cell using the reverse transcriptase enzyme to produce DNA from its RNA genome. The DNA is then incorporated into the host’s genome by an integrase enzyme. The virus thereafter replicates as part of the host cell’s DNA. Retroviruses are enveloped viruses that belong to the viral family Retroviridae. A special variant of retroviruses are endogenous retroviruses, which are integrated into the genome of the host and inherited across generations. Endogenous retroviruses are a type of transposon.
Scientists believe that amphibians evolved from bony fish. C.
Sometimes some questions don't have a submit button. This happened to me and I know that you just have to move onto another question. Then when you find one that has an answer button you type in you answer and press the answer button for points.
"C. Ecosystem"
An ecosystem is described by the interaction between living organisms in a given area, interacting with others, and non-living aspects of the environment where they are in. By considering the living place of a woodchuck, what they eat, and where they feed, we are talking about an ecosystem.
