Identify the function of the labeled structures.
a:
b:
c:
d:

options-
-connects arteries and veins
-brings blood back to the heart
-carries blood away from the heart
-pushes blood into the arteries

Using the periodic table, determine which material is most likely a good conductor

In what for do plants utilize nitrogen? why do they need nitrogen?

Amarine ecologist has constructed the conceptual model shown in the diagram. what predictions can be made from using this model? where the tertiary consumers get their energy how often primary producers are able to reproduce when bacteria and fungi initiate the process of decomposition whether other secondary consumers are present