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The __________ lobe of the cerebral cortex receives information gathered by photoreceptors.

The drug __________ in tobacco products causes neurons to release dopamine, which reinforces dependence on this drug. Occasional __________ users experience euphoria, alterations in vision and judgment, and distortions of space and time. Heavy use of __________ often leads to liver damage.

__________ equilibrium is called for when the entire body is moving. Fluid in the semicircular canals displaces the gelatinous material within the __________. For __________ equilibrium, movement occurs in one plane (vertical or horizontal), and the otoliths in the _________ and saccule are displaced in the gelatinous material, bending the cilia of the hair cells. Hair cells in the ampullae and utricle and saccule synapse with the __________ nerve.

A biogeochemical cycle involves only the abiotic components of an ecosystem and describes how chemicals circulate through those components.

Both energy and chemicals cycle through an ecosystem and are not lost.

Minerals in rocks are considered what type of component of a chemical cycle?

Over 40% of the world population lives within 100 km (60 miles) of a coastline.

What is involved in the process of denitrification?

A sustainable society is one that provides all of the goods and services desired by humans.

The population growth in LDCs is