Help please 15 pts!!

Heat is the amount of heat required to change the temperature of 1 gram of a substance by 1°c, and it is related to the chemical composition of the substance.

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above

Pl as time goes by and water goes through the water cycle again and again, the amount of water on earth: increases decreases ostays the same goes up and down