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The principle of superposition may be used to determine the relative age of a fossil that
occurs in sedimentary rock.
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False
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Which statement is true about the cell theory? a) it is well-supported by evidence. b) it is unchangeable and permanent.

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.

Which are reasons cells undergo cell division?