You could put a plant in a plastic bag and monitor the CO2 concentration in the bag.
Power/electricity, when the water flows through newer dams, the power of the current spins turbines, generating energy.
A direct observation usually refers to observing a behavior and knowing exactly what is happening. For example, if I see a pigeon peck at some bread, I have observed it pecking. With direct observation, I cannot assume it is eating, that it is hungry, that it has any intention whatsoever. All I know is that it pecks.
Answer:
When precipitation exceeds evapotranspiration and runoff in an area, the result is moist soil and possible flooding. Vegetation reduces runoff in an area but increases evapotranspiration. ... The volume of water moved by a stream in a given time period.
: ) x
The answer should be B because the central nervous system is the spinal cord and brain.
