One mother bear has a cub with extremely thick fur and another with thin fur. If the temperature of the arctic increases over the next 50 years, which type of polar bear fur thickness would we see in future generations? Why?

Liquid water turns into water vapor at which step in the water cycle? a. precipitation o b. water run off c. evaporation d. condensation

How does the molecular clock work? a. it analyzes the brain functionality of two different species.b. it examines and compares the physical characteristics of two different species.c. it illustrates relationships between two different species.d. it compares the number of mutations that exist in the dna of two different species.

Ascientific idea becomes valid when it is what?