Jeff finds a pond during a nature walk, and he has some questions based on his observations of the pond.
which question can he answer through a scientific investigation?
which organisms are part of the food web in the pond?
how much money should be spent to make the pond more attractive?
which pond animals would make the best pets?
which plants in the pond are the prettiest in summer?

Which organisms are part of the food web in the pond?

Explanation:

Jeff knows that any organism, living in the pond but not seen during his walk, needs a source of energy to survive, plants need the sun, fishes need plants or phytoplanktons to survive, amphibians can eat fishes or plants. So this might be the more reasonable and scientific question he could ask  

Which organisms are part of the food web in the pond?

Explanation:

This option can be answered through a scientific investigation, because in order to answer it, Jeff can formulate a hypothesis (based on the food web previously observed by other investigators in other ponds), make observations to confirm or not his hypothesis, and then reach a conclusion.

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