23. Only small amounts of enzymes are required for
reactions within cells because enzymes are
(1) fragile
(2) reused
(3) small molecules
(4) constantly synthesized

Which theory suggested that the earth was once a signle supercontient that gradually that broke up into the contients that we know today

On this map of the united states the letter h indicates high pressure and the letter l indicates low pressure . select the black arrow that accurately shows the direction of the wind.

Technology has affected regional settlement patterns in what ways? choose all that apply. climatic improvement strategies have improved crop productivity. mechanized agricultural methods have improved agricultural productivity. participation in the global economy has increased urbanization. population shifts from urban to rural areas has increased as a result of petroleum production. settlement areas have increased as a result of improved water storage and delivery systems.