Determine which type of sampling is most appropriate. Biologists divide the regions where Red foxes are found into the Nearctic, Palearctic, Oriental, Ethiopian, and the Australian region. They plan to follow 100 female foxes from each region to find the average (mean) number of their offspring.

The sampling technique used here is Stratified random sampling.

Step-by-step explanation:

Stratified random sampling is a sampling procedure where the researcher first divided the entire population into groups, known as strata. These groups are homogeneous in nature.

Then from these strata a simple random sample of individuals are selected.

In this case the Biologist first divide the entire region of Red foxes into various groups. Then he samples 100 female foxes from each of these groups.

This is an example of stratified sampling.

Thus, the sampling technique used here is Stratified random sampling.