Comets are probably made from leftover matter from the formation of a. the solar system. c. the gas giants. b. earth. d. the sun.

Legumes, a type of plant, require rhizobia, a type of soil bacteria, to survive since these organisms fix nitrogen during photosynthesis. rhizobia use the legumes for food. what would most likely happen to the legume population if rhizobia suddenly became extinct?

The energy required to vaporize a certain amount of a substance is greater than the amount of energy necessary to raise the temperature of the same amout of that substance by 1 degreee celcius

As the earth formed, the force of gravity increased due to increased mass. what effect did this increased gravity have on the forming planet?