A scientist was taking water samples, but forgot to label them! Sample A was taken in the Gulf of Mexico, Sample B was taken at the mouth of the Mississippi River and Sample C was taken in the Mississippi River. Explain how he could determine which sample is which.

The terrestrial planets are characterized by having a a.) silicate core b.) iron-rich silicate core c.) iron-rich metallic core d.) none of these

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?

Which hypothesis most likely explains the results at 60°c and 70°c