Which of the following is an example of a tissue?
A) heart muscle
B) heart
C) red blood cell
D) circulatory system
Answer: A
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Gene sequences that evolve at a constant rate can be used to
a. index the time of divergence between two species. d. index the number of extinct species within a lineage. b. calculate speciation rates across lineages. e. calculate extinction rates across lineages. c. calculate speciation rates within different lineages.
What are some ways of reducing plastic pollution in the ocean?
What will be an ideal response?
Small doses of ionizing radiation over a long period of time cause less damage because
a. they are too low to affect cells. b. they don't hit as many targets. c. the body has time to repair damaged DNA. d. the radiation is absorbed by macrophages. e. the radiation is absorbed by red blood cells.
Which is the normal direction in which the nerve impulse flows?
A. axon—soma—dendrite B. dendrite—soma—axon C. soma—dendrite—axon D. dendrite—synapse—axon