Answer:
The early atmosphere was mainly carbon dioxide and water vapour. Water vapour condensed to form the oceans. Photosynthesis caused the amount of carbon dioxide to decrease and oxygen to increase.
Hope it helps!!!
Answer:
D. The organelles are enclosed in membranes
Explanation:
One defining characteristic of eukaryotes is that they have membrane-bound organelles. If a cell lacks a water-storing vacuole, that could mean it is a prokaryote too. If a cell lacks a Golgi apparatus, it can never be a eukaryote. RIbosomes are characteristics of both prokaryotes and eukaryotes. D. is the best evidence that the cell is a eukaryote.
Answer: D) retroviruses
Explanation:
Retroviruses are a type of virus that converts its genetic material into DNA using a special enzyme, called reverse transcriptase. The DNA is then able to integrate into the DNA of the host cell. Once integrated, the virus can make additional viral particles using the components of the host cell.
Retroviruses which cause cancer at low incidence do not contain host information inserted. Rather, they tend to cause cancer via the expression mutation of potentially oncogenic host genes. Retroviruses incorporate proviral DNA into their host's chromosomal DNA during their natural life-cycle. Provirus DNA promoter affect regulatory gene expression over.
Hence, the correct option is D.
The longest stage of the cell cycle is called interphase. Interphase is the stage that occurs in between cell divisions. During interphase, the cell grows and develops and performs its functions. (Hope this helps!)
