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Aleonysh [2.5K]
3 years ago
6

What is a retrovirus

Biology
2 answers:
gogolik [260]3 years ago
7 0
Retrovirus is a virus that is composed not of DNA but of RNA.
avanturin [10]3 years ago
5 0
<span>A retrovirus is anything of a group of RNA viruses that insert a DNA copy of their genome into the host cell to replicate.
your welcome 

</span>
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Fossils of mollusks would be found in lower strata than that of arthropods

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Fossils are found in different layers of sedimentary rocks. The fossils of organisms that evolved earlier are found in the lower strata while those evolved later are preserved as fossils in the upper strata.  If mollusks evolved before arthropods, fossils of arthropods would be present in upper layers while those of mollusks would be found in deeper layers.

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(C) each cell of an organism has all the genes needed for development.

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According to my research on studies conducted on Genetics, I can say that based on the information provided within the question this illustrates that each cell of an organism has all the genes needed for development. If this were not the case then the frog would either not be born or would be born with serious abnormalities because the cell did not have the necessary genes needed for the frog to form correctly.

I hope this answered your question. If you have any more questions feel free to ask away at Brainly.

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