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1.) D. Population

• A population is a subset of individuals belonging to a single species that live in a particular geographic area and interbreed in sexually reproducing species. For some species, establishing population boundaries is easy; it is challenging for others.
• Plants and animals that live on islands, for example, have a geographic range bounded by the island's perimeter. In comparison, other species are spread over broad areas, making it more difficult to define the borders of local populations. There is a continuum between closed people that are geographically isolated from and do not interact with other populations of the same species and open populations that exhibit variable degrees of connectivity.

2.) B. Ecology

• Ecology is the study of the links between living species, including humans, and their physical environment; it aims to comprehend the vital connections between plants and animals and the rest of the world. Ecology also gives knowledge on the benefits of ecosystems and how humans might use Earth's resources sustainably for future generations.

• Ecologists examine these interactions between species and habitats of varying sizes, from minuscule bacteria living in a fish tank to the convoluted interactions between thousands of plants, animals, and other groups found in a desert. Ecologists also research a variety of other habitats. Ecologists, for example, may study bacteria that live in the earth beneath your feet or animals and plants that live in a rain forest or the ocean.

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