Which of the following is the most obvious sign of cluster distribution in termites?
a. they are insects.
b. they are detritivores.
c. they are social insects.
d. many species of termites are considered pests.

c. They are social insects.

Explanation:

The termites are the social insects because of the fact that instead of attacking over the wooden material alone they colonize over the wooden substrate. Each individual termite insect shows a social behavior. The termite colony shows a division of labor and reproduction to increase the chances of survival. The termite queens exhibit the longest lifespan as compared to other type of insects of the world. Colonies of termites are self regulating in nature.  

i think the miocene epoch spans the time from 23 million to 12 million years ago.

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.