What can you infer from this graph?
1.The population no longer exists.
2.6000 individuals is more than the habitat can support.
3.The carrying capacity of reindeer is about 6000 since that is the maximum number that was attained.
4.The population crashed because it had increased far past the number of individuals that the habitat could support, so both 1 and 2 could be inferred from the graph.
4
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When you are upright, what is the primary mechanism that propels blood in your feet back to your inferior vena cava?
A. recoil of elastic fibers in the walls of the leg veins B. contraction of the left ventricle of the heart C. contraction of smooth muscle in the walls of the leg veins D. contraction of skeletal muscles in your legs E. the valves in the leg veins alternating between open and closed
An incomplete digestive system is seen in:
a. flatworms only b. cnidarians only c. both roundworms and annelids d. both cnidarians and flatworms e. mollusks
Microevolution is the result of all of the following EXCEPT
a. chance variation. b. change in gene frequency. c. mutation. d. natural selection. e. large scale patterns or trends.
The main criteria presently used for grouping viruses does NOT include
A) structure. B) chemical composition. C) similarities in genetic makeup. D) host infected.