The burning of fossil fuels has greatly increased the level of CO2 in the atmosphere. If the level of CO2 continues to rise, which will most likely occur in an ecosystem?
O A. The number of producers and consumers will increase.
O B. Acid rain will have a much higher pH.
O C. The levels of groundwater will increase significantly.
O D. The atmospheric temperature will increase.

Which best describes the digestive system of arthropods? a incomplete, two openings b complete, one opening c two-way, one opening d one-way, two openings

{answer found. it's (3 ) }which statement describes the cell cycle? (1)the cell cycle is a process in which one cell divides into four genetically different cells. (2)the cell cycle is a process in which one cell divides into two genetically different cells. (3)the cell cycle is a process in which one cell divides into two genetically identical cells. (4)the cell cycle is a process in which one cell divides into four genetically identical cells.

The chemical form of energy that is useable by the cell to do work