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mars1129 [50]
3 years ago
5

Based on cell theory, why is a virus considered non-living? A) A virus does not have a nucleus. B) A virus does not contain gene

tic material. C) A virus is too small to be considered a cell. Eliminate D) A virus cannot reproduce itself without a host cell.
Biology
2 answers:
NeTakaya3 years ago
7 0

<u>Answer:</u>

The correct answer option is D) A virus cannot reproduce itself without a host cell.

<u>Explanation:</u>

Viruses cannot keep themselves in a stable state as they are not made out of cells they don’t grow so they cannot make their own energy.

Though these viruses do replicate and adapt to their environment but they are are more like androids than real living organisms.  

They lack the ability of reproduction without the help of a host cell and do not use the typical cell division approach to replicate.

marshall27 [118]3 years ago
3 0

D, A virus can not reproduce without a host cell.

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The correct answer is - option C.

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Thus, the correct answer is - option C.

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Can someone write the first paragraph
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Hii!!

The purpose of mitosis is to create two new perfectly identical cells when either there is a need to replace old or damaged cells and to reproduce asexually by making new cells. Some organisms use mitosis to replace body parts. For example starfish replace lost arms by mitosis. Some organisms such as the hydra use mitosis to produce genetically identical offspring.

There are four stages of mitosis: prophase, metaphase, anaphase and telophase.

1) Prophase: chromatin into chromosomes, the nuclear envelope break down, chromosomes attach to spindle fibres by their centromeres

2) Metaphase: chromosomes line up along the metaphase plate (centre of the cell)

3) Anaphase: sister chromatids are pulled to opposite poles of the cell

4) Telophase: nuclear envelope reforms, chromosomes unfold into chromatin, cytokinesis can begin

● The order of the stages of mitosis can be remembered using the mnemonic PMAT.

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Explanation:

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4 years ago
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Answer:

<u>Option-</u>

  • As many believe after doing an extensive form of research work of years that reptiles are the ancestors of the mammals that we see now. Which means that we mammals evolved from the pre-historic form of reptiles.                                                                            

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  • Fossils of Thrinaxodon, a species that lived during the Triassic period, have been found in both South Africa and Antarctica. Thrinaxodon had a reptile-like skeleton and laid eggs, but small depressions on the front of its skull suggest it had whiskers and, therefore, fur. Thrinaxodon may have been warm-blooded. The fossils of Thrinaxodon are consistent with the hypothesis that <u>mammals evolved from the pre-historic reptiles.</u>
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