An advantage of human testes being positioned in an external sac rather than in the abdominal cavity is that the
A) distance that semen must travel during ejaculation is shortened.
B) distance that sperm must swim during insemination is shortened.
C) testes can be kept cooler than the body's interior.
D) testes can enlarge during sexual maturation.
Answer: C
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Drought affects human society by causing
a. widespread crop failure. b. dried up wells. c. livestock death. d. human starvation. e. all of these.
Provide a 1-sentence explanation of how each of the following structures can be used to propagate
plants asexually: suckers, corms, stolons. BONUS: Identify one representative plant that is capable of each type of reproduction identified What will be an ideal response?
Which of the following is an example of an effect of natural selection.
A. all of the children of two parents are male. B. carbon cycles through ecosystem. C. favorable environmental conditions cause an increased food supply. D. polar bears have white fur.
When "matching" a donated organ or tissue to a recipient, it is necessary that the ________ of the donor and the recipient be as similar as possible
A) blood type B) T helper cells C) antibodies D) APCs E) MHCs