The ___ era had many extinctions because of large variations in climate A. Mesozoic
B. Precambrian
C. Paleozic
D. Cenozoic

Science A P E X

small, big, or no change could occur in the phenotype. it could cause something as simple as a cats ears to curl backwards or something as frighting as death. it could also occur in the protien-coding area and have an effect on that but no effect on the amino acids. what has to occur is a changing in the hox gene or the control gene.

since there are no options posted i'll give you a few examples.

a dolphin's flipper, bird's wing, cat's leg.