A renewable source of energy is ____________.
A. Petroleum
B. Coal
C. Nuclear fuel
D. Trees
A. Petroleum
B. Coal
C. Nuclear fuel
D. Trees
A. Clostridium
B. Rhizobium
C. Nostoc
D. Nitrosomonas
A. Earth
B. Top of the atmosphere
C. North and south poles
D. None of these
A. Afforestation
B. Deforestation
C. Non-forestation
D. Bio forestation
A. East
B. West
C. North
D. South
A. natural nutrients in excess
B. human organic wastes
C. non-biodegradable chemicals
D. waste animal feed
A. A great environmental resistance
B. No environmental resistance
C. No biotic potential
D. A fixed carrying capacity
A. Chlorofluorocarbons (CFCs)
B. Molecular oxygen (O2)
C. Nitrous oxide (N2O)
D. Carbon dioxide (CO2)
E. Methane (CH4)
A. Carbon dioxide and nitrogen
B. Oxygen and water vapor
C. Nitrogen and oxygen
D. Oxygen and helium
E. Oxygen and ozone
A. An increase
B. A decrease
C. No change
D. Unstable oscillations