During orgasm, which of the following stimulate a
feeling of pleasure?
a. LH
b. endorphins
c. testosterone
d. oxytocin
e. all of these
Answer: b
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Homologous recombination has been observed in
A) Archaea. B) Bacteria. C) Eukarya. D) Archaea, Bacteria, and Eukarya.
What is the difference between chemical evolution and biological evolution?
What will be an ideal response?
Which of the following is required for natural selection to occur in a population?
A. accumulation of adaptive traits B. differential reproduction C. heritable variation D. All of the choices are correct.
Why is a newly molted crab unusually slow and clumsy?
A) Its new exoskeleton cannot support the forces that its muscles generate. B) It temporarily lacks an exoskeleton. C) Its muscles are still forming their connections with the new exoskeleton. D) Its neurons are still forming their connections with the new muscles.