The fossil record helps scientists identify a single species from which other organisms have descended. Which is used to refer to this single species?

parent organism
fossils
descendant
common ancestor

Any sound above what db can cause hearing loss in human beings

If people from georgia have just experienced an extremely cold winter the last couple of months, what would the climate most likely be classified as? polar temperate maritime tropical

1. in what ways have non-native species been beneficial? 2. what are some of the hypotheses for the collapse of honeybee colonies? 3. distinguish between regional and functional extinction. 4. why is it difficult to measure background extinction rates? 5. what three factors are most important in causing extinction rates to climb?