Biology, 06.01.2020 08:31, hunterkerlin20p3l6ff

Why is it necessary to separate oxygenated and deoxygenated blood in mammals and birds?

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Biology, 22.06.2019 01:30, ayoismeisalex

Which is an advantage of having memory cells when a pathogen is encountered for a second time. a) the memory cells are what proliferate into clones of cells in response to the binding of an antigen. b) memory cells are vital to the primary immune response in that they immediately recognize pathogens even at the first encounter. c) memory cells are essentially effector cells that are short lived and attack antigens even without having a receptor specific to that antigen. d) it ensures that more lymphocytes with a receptor specific to a particular antigen will be present than in a host that had never encountered that pathogen.

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Biology, 22.06.2019 05:20, jason9394

Categorize each term as something that is typical of a scientific theory, a scientific hypothesis, or both. makes predictions

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Biology, 22.06.2019 07:00, dlatricewilcoxp0tsdw

Which best describes a gene? a. a sister chromatid b. a chromosome c. a tetrad d. a piece of a chromosome

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Biology, 22.06.2019 11:00, imelda249

What happens as electrons move along the chain of molecules known as the electron transport chain? they gain energy, which causes atp molecules to lose phosphate groups. they gain energy, which causes h *ions to join with oxygen to produce water. they lose energy, which is then used by the cell to make atp. they lose energy, which is then used to break down atp.