Before the appearance of cells capable of sexual reproduction, ____
A)there was no life on Earth
B)evolution was comparatively slow
C)evolution was comparatively fast
D)cells could not reproduce
E)multicelled organisms existed
B
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The fundamental difference between a motor and a generator is
A. a motor operates on force and a generator generates force. B. that input and outputs are reversed. C. both of these D. neither of these
Which reproductive pattern is most common, if one considers patterns seen in all animals?
a. Producing large numbers of offspring at short intervals, and providing no parental care or protection. b. Producing few offspring later in life, and providing extensive parental care and protection. c. A reproductive pattern that is somewhere between the two extremes described in a and b. d. Most living organisms actually switch between the two patterns described in a and b. e. No such patterns have ever been observed in nature.
According to the cross section, where has the greatest change in the water
table elevation occurred relative to the river and higher elevations? What will be an ideal response?
Glaciers cover ________ of Earth's surface and contain ________ of Earth's fresh water
A) 1%, 90% B) 5%, 41% C) 14%, 63% D) 10%, 84%