Which of the following appeared last in the evolutionary timescale

What will be an ideal response?


flowering plants

Biology & Microbiology

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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

Biology & Microbiology

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.

Biology & Microbiology

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?

Biology & Microbiology

What does evolutionary fitness measure?

A) physical health B) longevity C) relative reproductive success D) population size

Biology & Microbiology