The most effective level of defense against pathogens is the ____ immune system, because it ____
a. innate; recognizes specific pathogens
b. adaptive; recognizes specific pathogens
c. nonspecific; targets all pathogens
d. inflammatory response; is mediated by T cells
e. skin; provides a physical barrier against pathogens
b
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Number 4 in the figure is an example of:
a. recapitulation via hypermorphosis. c. paedomorphosis via progenesis. b. recapitulation via acceleration. d. paedomorphosis via neoteny.
How did Theodor Engelmann determine which colors of light were used in photosynthesis?
What will be an ideal response?
Which number identifies the structure that carries supplemental genetic information?
a. 1 b. 2 c. 3 d. 4 e. 5
Imagine a chart showing the number of people in different age groups (0 to 5 years old) as blocks in proportion to the number of people in each age group
If each of these age blocks is shown stacked with the youngest at the bottom and the oldest at the top, what shape will the whole stack assume when there is a rapid population doubling time? A) expanding pyramid B) uniform column C) inverted pyramid D) hourglass