Which of the following appeared last in the evolutionary timescale
What will be an ideal response?
flowering plants
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The activation of helper T cells is likely _____
A) when an antigen is displayed by a dendritic cell B) when a cytotoxic T cell releases cytokines C) when natural killer cells come in contact with a tumor cell D) in the bone marrow during the self-tolerance test E) when B cells respond to T-independent antigens
After a steroid hormone binds its receptor, the hormone-receptor complex then:a
activates a G protein. b. activates a protein kinase. c. activates adenylyl cyclase. d. activates calmodulin. e. binds DNA.
Give examples of at least two species that are either extinct or facing extinction due to each of the
following: 1) destruction of habitat, 2) biotic pollution, 3) unregulated hunting and poaching, 4) deliberate pest or predator control, and 5) commercial harvesting. What will be an ideal response?
What does evolutionary fitness measure?
A) physical health B) longevity C) relative reproductive success D) population size