What is the best measuring stick to use to determine the degree of fitness in evolutionary selection?
a. the increase in lifespan resulting from selection
b. the increase in chromosomal number within the nucleus
c. reproductive success
d. the number of available alleles for any one gene
e. the increase in geographical territory for any one species

Which of the following statements is most likely correct about a rock belonging to the jurassic age and a rock belonging to the cambrian age? options: 1) they have identical fossils of organisms that have evolved over time. 2) both have animal fossils preserved in them due to weathering and erosion. 3) they contain different fossils because life on earth has changed through time. 4) the fossils in them were formed on the surface of earth due to exposure to sunlight.