A critical biotic factor in Yellowstone National Park is high elevation high temperatures in the summer population of wolves proximity to water

The question seems to be asking for a critical biotic factor in Yellowstone National Park. Biotic factors are living or once-living organisms in the ecosystem. These are the animals, plants, fungi, etc. that make up an ecosystem.

The options given are:

1. High elevation
2. High temperatures in the summer
3. Population of wolves
4. Proximity to water

Out of these options, the only biotic factor is the population of wolves. The other options (high elevation, high temperatures in the summer, and proximity to water) are abiotic factors, or non-living factors that can affect an ecosystem.

So, the answer is: The critical biotic factor in Yellowstone National Park, from the given options, is the population of wolves.