Horses are much larger today than their two-foot tall ancestor, mesohippus. geologists believe the change in size was the result of changing environments, from tropical forests to a grassland habitat.

larger size would be an advantage for survival in this new habitat because
a)
taller horses could reach the leaves that grow high on trees.
b)
larger horses could find food easier than the shorter horses.
c)
the larger horses were better camouflaged than the smaller horses.
d)
larger horses had longer legs and could run faster to escape predators.

Two students are working together on an experiment that measures the effect of different liquid fertilizers on the thickness of plants’ stems. which is most likely to result in the greatest amount of error in their scientific experiment? a.one student measures the plant stem widths by using calipers. the other student measures the widths of the same plant stems again by using a different pair of calipers. b.one student measures the plant stem widths by using calipers. the other student types the measurements as they are taken into a computer spreadsheet. c.one student weighs liquids for the experiment by using a calibrated scale. the other student weighs liquids for the experiment by using a different calibrated scale.