astrophysicists study the stars and other celestial bodies. during their observations, they can only see the stars exploding, but they cannot hear it, even with powerful microphones. what could be the best explanation for this?

Apaleontologist finds a plant fossil that shows that the plant had seeds. what can the paleontologist conclude?

Hector is back from his morning run and is feeling light-headed because his energy is depleted which food item will provide him with a quick source of carbohydrates

The greenhouse effect a. something that has occurred for millions of years b. an unnatural phenomenon caused by humans that maintains earths temperature range. c. the results of the differences in the angle of the suns rays d. an unnatural phenomenon that causes heat energy to be radiated back into the atmosphere