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Alborosie
3 years ago
15

According to cell theory, viruses are considered nonliving because they

Biology
2 answers:
jarptica [38.1K]3 years ago
6 0
D) lack the ability to reproduce without as stated in cell theory
iris [78.8K]3 years ago
3 0

Answer: D) lack the ability to reproduce without a host.

Explanation:

Those who argue that the virus is not a living thing assume that he has no free life, for its replication is possible only within a living cell. Also, some of these agents can crystallize when subjected to adverse situations. Although they can replicate, viruses do not have the enzymatic apparatus sufficient for replication, thus requiring the cellular machinery to complete its replicative cycle, which makes it a mandatory intracellular parasite.

Its apparent fragility, being strictly cell-dependent, is dismissed by its ability to control and redirect cellular metabolism to its benefit. Despite the low structural complexity, it can cause major damage to the host cell, even though morphologically presenting only genetic material, a capsid and, in some viruses, an envelope.

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Oxygen levels stay above 15 percent starting 200 million years ago

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The presence of O 2 and evolution of oxygen gave new opportunities to the life on Earth. Oxygen levels in atmosphere have fluctuated between 15% and 35% of atmospheric volume, since the start of the Cambrian period.

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