What is the struggle for food space and other limited resources called?

What is the 77 element on the periodtic table

Most of the fossils found in virginia are in the coastal plain, valley, ridge, and appalachian plateau regions, best suggesting that these geographic provinces a) were once covered by seawater. b) are the oldest parts of virginia. c) have a great deal of karst topography. d) have large amounts of sedimentary rock.

Why does bubbling occur when vinegar mixed with baking soda