When members of two different populations breed, which selection pressure has occurred?
a. Genetic drift
b. Natural selection
c. Sexual selection
d. Gene flow
e. Founder effect
d
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Patients diagnosed with hypercortisolism may have tumors that secrete _____
A) growth hormone B) adrenocorticotropic hormone (ACTH) C) estrogen D) leptin
Which of the following is not a char of all living organisms?
a. response to stimuli b. adaptation c. sexual reproduction d. regulation of internal environment e. acquisition of energy
Echinoderms are members of the Bilateria but many members of the group (e.g., the sea stars) lack a brain, have no specialized sense organs, and have radial nerves that extend down each "arm" from a central nerve ring that surrounds the gut
What was a likely selective pressure in the evolution of this type of nervous system? A. ability to move forward B. role as a predator in the ecosystem C. multicellularity D. possession of an endoskeleton of calcium carbonate E. None of the above.
Aerobic respiration, anaerobic respiration, and fermentation:a
are endergonic pathways. b. release free energy. c. require oxygen. d. are also known as organismic respiration. e. are anabolic pathways.