It can be inferred that on the basis of the1981 discovery of conodont remains, paleontologists could draw which of the following conclusions?

The second paragraph in the passage serves primarily to

According to the passage, the anatomical evidence provided by the preserved soft bodies of conodonts led scientists to conclude that

The author of the passage refers to Pliny most probably in order to

The author refers to “bacterial infections”(see highlighted text) most likely in order to

Of the following topics, which would be most likely to be studied within the discipline of chemical ecology as it is described in the passage?

According to the passage, which of the following is true of plant antiherbivore chemistry?

According to the passage, present-day columnar cacti in the Sonoran Desert differ from their close relatives in southern Mexico in that the Sonoran cacti

According to the passage, which of the following types of nectar-feeding pollinators is likely to be an unreliable pollinator of a particular cactus flower?

The primary purpose of the passage is to