C. Macrophages

When Macrophages approach a foreign pathogen they ingest the pathogens through phagocytosis, the Macrophages show the foreign antigen proteins on their cell surfaces.

The Helper T Cell recognizes the antigen on the surface of the macrophage and starts an immune response to the invading pathogen by sending out a chemical message

After that the B-cells produce antibodies that are specific to the antigens of the pathogens that slow them down so the macrophages can engulf them.

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4 years ago

A male or female reproductive cell is called a: a) zygote b) gamete c) embryo

konstantin123 [22]

C) embryo Im pretty sure

Hope this helps

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3 years ago

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How can we know whether a tree is alive or not?

solong [7]

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One of the best ways to determine if a tree or any plant is dead is the tree scratch test. Just beneath the dry, outer layer of bark in a tree's trunk lies the cambium layer of bark. In a living tree, this is green; in a dead tree, it is brown and dry

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3 years ago

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How and why does a comet change as it approaches the sun?

Archy [21]

It melts into a tail and vanishes

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3 years ago