The hypothesis that the fossil in layer d is younger than the fossil in layer c is supported by the

a) law of gravity.

b) law of relativity.

c) law of superposition.

d) law of thermodynamics.

Why do some dna fragments move farther than others during gel electrophoresis? a. because their shapes are different b. because they are different types of molecules c. because the samples are different colors d. because their masses are different

The table below shows data for a population of fish in a pond. fish body color # of fins scales? tail shape a silver 4 yes fan b pink 4 yes flat c black 4 yes fan d orange 4 yes flat e orange 4 yes fan f silver 4 yes flat which of the above characteristics would be most in developing a classification system for the fish? a. body color and tail shape b. presence of scales and tail shape c. body color and number of fins d. number of fins and presence of scales

If garbage is left on the street flies in microbes can arise from nothing to feed on it true or false