Unrepaired single-stranded dna breaks can lead to double-stranded dna breaks during the next round or replication. which repair pathway would be most appropriate for repairing double-stranded dna breaks?

a. base excision repair
b. dna proofreading
c. mismatch repair
d. nonhomologous end joining
e. nucleotide excision repair

Melting glaciers is a serious threat to the environment what is the possible consequence of melting glaciers on polar bears?

Examine the two squirrel populations in the accompanying figure. the populations are separated by a geographic barrier. if after a long period of time the two species are no longer separated, what evidence is needed to determine if speciation has occurred? the figure shows two populations of squirrels separated by a geographic barrier. examine the two squirrel populations in the accompanying figure. the populations are separated by a geographic barrier. if after a long period of time the two species are no longer separated, what evidence is needed to determine if speciation has occurred? the figure shows two populations of squirrels separated by a geographic barrier. polyploidy is creating new species. the two populations are not interbreeding freely. hybrid offspring of the two populations begin to appear. one species will increase into a population size twice as large as the other species.

How can an organ, such as the lungs, work for multiple body systems?