What evidence do we have that the orbits of the asteroids are modified by the gravitational influences of the planets?
What will be an ideal response?
Astronomers have evidence that the asteroids are the remains of material lying 2 to 4 AU from the Sun that was unable to form a planet because of the gravitational influence of Jupiter, the next planet outward. Over the 4.6-billion-year history of the Solar System, most of the objects originally in the asteroid belt have collided, fragmented, and been covered with craters. Some asteroids were perturbed by the gravity of Jupiter and other planets into orbits that collided with planets or the Sun, caused them to be captured as planetary satellites, or ejected them from the Solar System. The present-day asteroids are understood to be a very minor remnant of the original mass in that zone.
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Bacteria that can absorb light energy and convert it into ATP are commonly called
A. cytochromes. B. lysosomes. C. chemotrophs. D. phototrophs. E. cytochromes AND chemotrophs.
The two major types of bacterial transposable elements are ____
a. DNA transposons and transposases b. DNA transposons and retrotransposons c. insertion sequences and retrotransposons d. transposons and transposases e. insertion sequences and transposons
What secretion emulsifies dietary lipids, allowing efficient digestion of fats?
Muscles, including the biceps muscle in the human arm, are organs. What can be inferred from this information?
a) muscle contains different types of specialized cells and tissues b) muscle contains only specialized muscle cells c) muscle is a part of each of the body's organ systems d) muscle contains unspecialized cells that form a tissue