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In humans, blood returning to the heart from the lungs enters which chamber of the heart?

 This map illustrates the number of amphibian species across the globe.   A similar pattern is observed for most taxonomic groups. Using the color coded key, what trend do you see?   

The relative energy in trophic levels in the Silver Springs, Florida, ecosystem is shown.  Refer to the diagram below:   

The relative energy in trophic levels in the Silver Springs, Florida, ecosystem is shown.  Refer to the diagram below:   

Which of these levels of ecological study involves an interaction between abiotic and biotic components?

Fluctuations in population growth can correlate to changes in:

Fluctuations in population growth can correlate to changes in:

The molecule below is cholesterol. One place it is found is in the plasma membrane.  It is a  ________________.        

All of the following are functions of the lymphatic EXCEPT:

Extra Credit Question +1 pts (instructor graded): Bill Nye discussed population growth and its effects on resources and consumption over time. What kind of human population growth curve did he show us?