Darwin's ideas on evolution were based on a number of observations. Among the most important observation was that
a. all the types of organisms that have lived on Earth are present today.
b. individuals within a population are all virtually identical to each other.
c. there is usually ample food and water for all populations.
d. when natural resources become scarce, competition occurs between members of the same species.
e. populations will only produce as many offspring as can be accommodated by the environment.
D
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"Special pair" is the name given to the ________ in the photochemical complex of the purple bacteria
A) two bacteriochlorophyll a molecules B) two bacteriochlorophyll b molecules C) two quinones D) two reaction centers
Which of the following human cells are hosts
to HIV?
a. red blood cells b. nerve cells c. white blood cells d. muscle cells e. more than one of these are host cells to HIV
While wading in the ocean, you look down into the water and notice an umbrella-shaped, translucent animal. It swims by pulsing its body, and long tentacles trail behind it. One of them brushes your leg. Ouch! You feel a burning sensation where it touched
you. To what phylum does this creature probably belong? A) Porifera B) Cnidaria C) Platyhelminthes D) Mollusca
Which substance emulsifies fats in the small intestine?
A. digestive enzymes B. bile C. bicarbonate D. chymotrypsin E. hydrochloric acid