Biostratigraphic Dating Relies on

question 48

Multiple Choice

Biostratigraphic dating relies on

• A)the first and last appearances of species in the fossil record.
• B)magnetic shifts in the earth's interior.
• C)radioactive decay of carbon to nitrogen.
• D)the concentration of fluorine in the soil and in groundwater.

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Definitions:

Plasma Membrane

A bi-layer of lipids with embedded proteins that surrounds a cell, controlling the movement of substances in and out of the cell.

Acini Cells

Secretory cells in the pancreas forming the acini, which are small clusters producing digestive enzymes released into the digestive tract.

Alpha Cells

Cells located in the pancreas that produce glucagon, a hormone that raises blood glucose levels.

Beta Cells

Cells located in the pancreas that produce insulin, a hormone that regulates blood glucose levels.