In a mouse population inhabiting a grassland area, a mutation occurs that results in a new coat color allele. Which of the following factors has the greatest effect on whether the new coat color will become more common in the mouse population?
a) whether abundant food is available in the grassland
b) whether the new coat color allele is dominant or recessive
c) whether the rate of reproduction in the mouse population is stable
d) whether the new coat color allele increases the survival of mice in their
environment

The diagram below shows the layers of a rock having a trilobite: a rock column labeled rock is shown. the column has three layers. the bottommost layer of the rock has one shaded rhomboid shape, the middle layer has a rhombus with a diagonal along with two identical organisms marked as, trilobite, in the key, the top layer has two semicircles. a key is shown on the right side of the diagram. the shaded rhombus is marked as a, the rhombus with the diagonal is marked as b, the semicircle is marked as c which statement about the rock fossils is true?