In europe , three lineages of bears evolved in a common ancestor. two of those lineages led to present-day black bears and brown bears. the third lineages led to cave bears that went extinct 24,000 years ago. which of the following could explain why only one group of bears were extinct?

What is the importantence of the carbon and nitretan cycles in the environment

Twind is considered to be an abiotic factor because it.?

1. variations in a population of moths allow for some of its members to be able to adapt to environmental changes. the better adapted of the moths will be able to survive the change and thus prevail as the “fittest” of the species. (a) describe three mechanisms in which variation can occur within a species population. (b) explain which mechanism or mechanisms would be responsible for the survival of a population of peppered moths better than white moths in an environment affected by industrial soot. justify your answer.