71.
Assuming that the night will remain clear, calm, and unsaturated, the predicted minimum temperature is 32oF. Suddenly the wind speed increases and remains gusty throughout the night. The minimum temperature will most likely be:

72.
Energy flow in ecosystem is

74.
An association between two individuals or populations where both are benefitted and where neither can survive without the other is

75.
The relationship between nitrogen fixing bacteria and leguminous plants is an example for

77.
CFC releases a chemical which is harmful to ozone is

78.
Birth rate is called

79.
Death rate of the population

80.
Animals and plants are best protected in