An important principle scientists follow to determine ancient climates is:
a. larger plants and animals require warmer climates.
b. if an organism today needs certain conditions to live, then a similar organism that lived in the past needed similar conditions.
c. earth was warmer long ago, so the climates were too.
d. climatic changes today occur faster than in ancient times.

In cattle a single gene with two alleles determines fur color the fur can be red white or roan roan fur has both red and white hair which of the following statements is true a the allele for roan fur color is dominant over red and white fur color b the allele for red fur color is dominant over white and roan fur color c the roan and white alleles are expressed independently of the other d the red and white alleles are expressed independently of each other