The yearly rise and fall of CO2 levels in the atmosphere are caused by:
A. seasonal use of fossil fuels
B. regularity of volcanic activity
C. deforestation in the tropics
D. El Nino events
E. seasonal photosynthetic activity of green plants

4. if a cell is placed inside a solution that has a higher concentration of solute than on the inside of the cell, what can be said about the movement of water? a. water will move out of the cell, causing it to shrivel. b. water will move in and out of the cell at the same rate. c. water will move out of the cell, causing it to swell. d. water will move into the cell, causing it to swell.

What is used as a template during replication? a- mrna b- trna c- rrna d- dna

Which organelle plays a role in intracellular digestion?