which of the following limiting factors would be directly affected by a drought? a. birth/death rate b…

Brief Explanations:

A drought is a lack of water over an extended period. It directly reduces water - a crucial resource. This impacts the availability of water for plants, animals, and humans, thus directly affecting resource supply. Birth/death rate can be indirectly affected as a result of resource scarcity later. Immigration is more related to population movement and not directly tied to drought itself. Available niche is more about the ecological role and is not directly impacted by drought compared to resource supply.

Answer:

D. resource supply