In most ecosystems, the primary producers use energy from ______ to build organic compounds.

_____ is the vascular tissue that conducts sugars and other organic solutes.

True or False:  Islands closer to the mainland and larger islands will have more species than those smaller and further away from mainland.

_____ is the incorporation of nitrogen from nitrogen gas into ammonia.

_____ is the maximum number of individuals of a species that an environment can sustain.

True or False:  The guard cells regulate the passage of carbon dioxide out of the cell and oxygen into the cell.

Which type of tundra does not have permafrost?

_____ is the embryonic root of a monocot.

True or False:  A natural disaster would be a density-independent factor.

____ is warming of the Pacific Ocean waters.