Which of the following describes how different species depend on one another in a natural environment?
a. non-native kudzu out-compete native plants in the eastern united states.
b. giant african snails imported as pets damage native plants and crops in hawaii.
c. grasslands in the california floristic province have been converted into housing projects, shopping centers, and roads.
d. acacia trees of central and south america provide shelter for stinging ants, while the stinging ants snip surrounding plants that grow too close.

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before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.