What is a population? all the organisms in an ecosystem. a collection of all the abiotic factors in an ecosystem. a collection of all the biotic factors in an ecosystem. a group of organisms of the same kind or species.

a group of organisms of the same kind or species.

Explanation:

In Biology, the definition of population is something like:

"The number of organisms of the same species that are living in a specific geographic area at the same time and also have the capability of interbreeding"

So they must be of the same species and able to interbreed, which gives us a clear idea of what is the correct alternative.

hygrometers and hair thermometers (often found as part of hygrometers/psychrometers) can be used to measure humidity. barometers are used to measure atmospheric pressure, while anemometers are used to measure wind speed. so the 2nd and 4th choices should be the correct answers.