Freeze-thaw is an example of this.
a. physical weathering
b. chemical weathering
c. biological weathering
d. all of these

Suggest why placing wheels under a heavy box reduces the neccessary force required to push it along at a constant speed.

Which of the following would be an important part of a multi-step plan to restore the stability of the red-cockaded woodpecker's ecosystem?

What was the purpose of mendel's experiments with dihybrid crosses? a. to determine if dna was a transforming factor b. to determine if traits could be recessive c. to determine if traits affected each other d. to determine if traits had more than one allele