Abotanist observes a large population of a particular type of beetle eating the leaves of one tree but not the leaves of a nearby tree. what should the botanist do first to study the interaction of these organisms in the ecosystem?

The botanist should make an hypothesis for your observation (the interaction between population of beetle and leaves of trees)

Explanation:

According to the scientific method, the first step is to make observations about some process or system. In the present case, the botanist observes a large population of a particular type of beetle eating the leaves of one tree but not the leaves of a nearby tree.

Once an observation was made, the second step is to write an hypothesis that suggest something about the observation (for example beetles choose that trees that have more palatable leaves, or leaves with particular compounds).

After the ywo mentioned steps, the botanist can plan an experiment, execute it and so on.

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.