Most air pollution results from
a)the burning of fossil fuels
b)nuclear energy use
c)volcanic eruptions
d)the evaporation of chemicals such as paints and dry-cleaning fluid

Which of the following is an example of competition a. the leaves of a tree prevent a small shrub from getting sunlight. three species of birds feed a different heights in the same tree. b. three species of birds feed at different heights in the same tree c. zebra and giraffe’s feed on different grassland plants d. cats living in two different homes eat the same brand of cat food.