The use of ammonia as a refrigerant is a problem because it is -expensive -destructive to the ozone layer -toxic -damaging to the refrigerator components

Hurry which of these is true about index fossils? a) are very scarcely found b) used as guides in relative dating c) found in the youngest layer of the rock d) used as reference points in absolute dating

Which statement describes how favorable traits in a population relate to natural selection? they are the only traits that ever exist in the population. they build in the population over time. they are rarely passed on to offspring. they are found only in a few individuals within the population.

What is the role of dna ligase in the elongation of the lagging strand during dna replication?