Abiologist counts the number of zebras in a population each year and notices an increase in the zebra population. which describes the biologist’s actions?
experimentation
inference
observation
interacting

The correct answer for above statement is:

observation

Explanation:

Observation is the act or method of accurately watching someone or something.

Observation is the active appropriation of information from a primary source. In living beings, observation engages the senses. In science, observation can also include the recording of data via the use of scientific instruments. The term may also refer to any data accumulated during the scientific action.

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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.