- (A) A gas
- (B) A cloud droplet
- (C) A rain drop
- (D) A snowflake
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- (A) When the air temperature is highest
- (B) Just before sunrise
- (C) About midnight
- (D) When the air temperature is lowest
- (A) Flat
- (B) Medium
- (C) Regular
- (D) Rough
- (A) 3
- (B) 4
- (C) 5
- (D) 6
- (A) ozone accumulation
- (B) ozone depletion
- (C) acid rain
- (D) allergens
- (A) Air pressure
- (B) Air temperature
- (C) Air density
- (D) Wind speed
- (A) Air temperature
- (B) Relative humidity
- (C) Air pressure
- (D) Air density
- (E) The specific heat of air
- (A) all individuals having same phenotype
- (B) all individuals having same genotype
- (C) all individual with different phenotype
- (D) all individuals with different genotype
- (A) mutualism
- (B) parasitism
- (C) amensalism
- (D) commensalism
- (A) particulate pollutant
- (B) gaseous pollutant
- (C) aerosol
- (D) none of these
