Single-celled organisms are able to maintain
internal stability because they
(1) have multiple organ systems
(2) work with other cells
(3) contain structures that perform life functions
(4) carry out photosynthesis to produce food

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 is a true statement? a. individuals evolve to have adaptations. b. individuals have adaptations that can change over time. c. individuals have traits that may or may not make them successful at reproduction. d. populations cant evolve, only individual organisms.

Are the layers of rock above and below the coal older or younger?