1. If a wave is traveling across a boundary from a material of low density to high density will the velocity of the wave increase or decrease?

How is ribosomal rna useful as a molecular clock? a. a large portion of the dna ring is not vital to structure or function, allowing it to accumulate neutral mutations. b. its rate of mutation increases over time as organisms continue to evolve and differentiate from each other. c. a slow mutation rate makes it useful for determining evolutionary relationships between ancient species. d. it is only found in select organisms, making it easier to compare relationships between species that have it.

What would happen if the krill were removed from the food web

What is a group of organisms that are closely related and share similar characteristics