A small marine amphipod has recently been discovered that carries a bad-tasting organism on its back, which is contrary to its normal behavior. If a fish ingests the pair, it immediately spits them back out. If the amphipod is alone, however, it is readily eaten. There is no apparent benefit or harm in this relationship for the “backpack” organism. This is a case of

“Jerry! You have made a terrible mess! Now you get a spanking, and if you ever do it again, you’ll get a harder spanking.” This is an example of which technique?

Fossils from the Paleozoic are plentiful because

BICS is the language of academics and takes about two years to gain proficiency.

With closer supervision of children’s out-of-school activities, children of today do not have the opportunities to engage in the fun and excitement of rough-and-tumble that children of the past had.

In cladistics, ________ is(are) the primary criterion used to classify organisms.

This scientist developed the field of paleontology

Angiosperms are referred to as ________ when the male and female reproductive parts are on different individuals of the same species.

Mammals appeared and diversified in the Precambrian era.

Which of these statements is NOT correct about flatworms?