The term homologous structures describes

In the early stages of development many animals resemble each other. This means:

Why is studying viruses a part of biology?

One characteristic common in most terrestrial vertebrates is

The scientific name for a leopard frog would be

Viruses are not considered living because they

An antibiotic kills

Scientists believe these evolved after cells:

These non-living things use a host cell to reproduce:

Autotrophs produce their own:

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