A healthy ecosystem contains a diverse variety of species that factor into the food web within the ecosystem. It also has varied individuals within each population. Which of the following helps to keep an ecosystem diverse?

Increasing population density
interactions among communities
biotic factors
genetic variation

genetic variation

Increasing population density

Well, let's see. Increasing population density could actually lead to competition for resources and potentially decrease diversity. Interactions among communities could potentially promote diversity as different species interact with each other and exchange resources. Biotic factors, such as predation and disease, can also play a role in keeping an ecosystem diverse by controlling population sizes of different species. Lastly, genetic variation within populations is essential for adaptation and evolution, so it definitely contributes to ecosystem diversity. So, I would have to say that all of the options help to keep an ecosystem diverse, although some may have more direct impacts than others.

The factors that help keep an ecosystem diverse are interactions among communities, biotic factors, and genetic variation. Increasing population density does not necessarily contribute to ecosystem diversity, as it may lead to competition and resource depletion.

The correct answer is genetic variation. Genetic variation refers to the differences in the genetic makeup or traits between individuals within a population. It is an essential factor in keeping an ecosystem diverse. Here's how you can arrive at this answer:

1. Eliminate options:
- Increasing population density refers to the number of individuals in a given area, and it does not necessarily contribute to the overall diversity of the ecosystem. Therefore, it can be eliminated.
- Interactions among communities can certainly influence and shape ecosystems, but it may not directly contribute to maintaining diversity. Therefore, it can be eliminated.
- Biotic factors include living organisms and their interactions within an ecosystem, but it does not directly address diversity. So, it can also be eliminated.

2. Analyze remaining option:
The only option left is genetic variation. Genetic variation is crucial because it allows for a diverse range of traits and characteristics within a population. It provides the building blocks for adaptation and evolution, allowing species to better respond to environmental changes and challenges.

Thus, genetic variation is the factor that helps to keep an ecosystem diverse.