Cells. the basic units of lite! mastery test
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a particle can infect humans and make them sick. it attaches to a host cell and injects its rna which the host uses to make proteins for the particle
this particle cannot reproduce on its own and can only copy itself by using the machinery of the host
which explains whether the particle described is a virus or a cell?
a.
the particle is a cell because it does not make proteins and cannot reproduce by itself.
b.
the particle is a virus because it has genetic information and can infect humans
c.
the particle is a cell because it has genetic information and attaches to other cells
d.
the particle is a virus because it does not use energy and cannot reproduce by itself.
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biology is the study of life. it is the study of living organism.

estuaries are the partially enclosed coastal bodies of brackish water formed at the mouth of sea where river meets an ocean. it is a transition zone between river and sea water so estuaries are influenced to both marine environment such as tides, waves and to riverine such as flow of fresh water and sediments. the mixing of sea and fresh water provide high level of nutrients, making estuaries a high product habitats.

many estuaries suffers degradation from a variety of human activities like erosion from deforestation, overgrazing, overfishing, drainage and eutrophication.

so from the above statement answers will be

1. false as estuaries are formed due to both brackish and freshwater.

2.true, due to high productivity estuaries are breeding ground for many marine species.

3. direct and indirect activities of man that contribute to pollution and deposition of sediments.

condenser is used to focus in the light microscope.