Which headings best complete the chart?

A) X: Habitat Destruction
Y: Pollution

B)X: Long-Term Changes
Y: Short-Term Changes

C)X: Short-Term Changes
Y: Long-Term Changes

D)X: Pollution
Y: Habitat Destruction

Which plains area lies in both the united states and canada? altiplano central canadian shield coastal plains great plains

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.

Which is not a characteristic of bacteria? a. they are unicellular. b. they are prokaryotic. c. they are the smallest form of life on earth. d. they are multicellular.