Earth's plate tectonics
a)move only once
b)are constantly in motion
c)move only up and down
d)do not move

In dna, only the_ varies from one nucleotide to another. base phosphate sugar amino acid

Which statement correctly describes a way that mutations increase the likelihood that a species will survive in a changing environment

Which of the following was a characteristic of a dromaeosaur? modified front claw grasping with their forelimbs both a and b none of the above