According to the second law of thermodynamics, heat energy released by an organism is gone forever used by another animal released into the environment and unusable absorbed by plants for photosynthesis

The the passage this question was provided for, you may find the fallowing text: "When a process converts energy from one form to another, some energy converts into heat, a less usable form that disperses into the environment."

Released into the environment and unstable.

the answer is a. co2, this would be colder than the : )

explanation:

chemical digestion occurs in the stomach were hcl and pepsin forms chyme, the mouth in which salivary amylase breaks down starch to form bolus, and the small intestine specifically the duodenum.