The author of the passage mentions “escape velocity” （see highlighted text） in order to help explain which of the following?
According to the passage, which of the following is a prediction that is based on the strength of the gravitational attraction of small asteroids?
The discovery of which of the following would call into question the conclusion mentioned in the highlighted text?
The passage implies which of the following about the five asteroids mentioned in the highlighted text?
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?