In an endothermic reaction: a. heat is released by the system, and there is a positive change in enthalpy. b. heat is released by the system, and there is a negative change in enthalpy. c. heat is absorbed by the system, and there is a negative change in enthalpy. d. heat is absorbed by the system, and there is a positive change in enthalpy.

they include patterns; cause and effect; scale, proportion, and quantity; systems and system models; energy and matter; structure and function; and stability and change.

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when atmosphere interacts with biosphere they focuses on on the sources and sinks of green house gases (ghgs) air pollutants, particular matters, water and energy between the earth's surface and the atmosphere. the biosphere affects the climate. the atmosphere and biosphere are in constant interaction with each other, and all living things rely on gases in the atmosphere for life. organisms such as animals take in oxygen gas form the atmosphere to use in every cell of their body for smooth functioning of daily routine exercises.