Question

read the following excerpt from a student essay. how can the writer best improve his or her grammar and mechanics?

people around the world have always encountered frogs and toads in various bodies of water. unfortunately, pollution and disease is killing many of the world’s frogs. for example, a fungus may be responsible for the extinction of several species in australia and has been found in forty - four species there. other fungi and viruses have eliminated frogs in the united states as well. the effect of pollutants are also severe. substances like fertilizers and heavy metals are responsible for the deaths of many frogs in europe and canada.

by adding commas

by fixing subject - verb agreement errors

by fixing run - on sentences

Explanation:

The sentence "Unfortunately, pollution and disease is killing many of the world's frogs" has a subject - verb agreement error. The subject "pollution and disease" is plural, so the verb should be "are" instead of "is". Also, "The effect of pollutants are also severe" has a subject - verb agreement error. The subject "The effect" is singular, so the verb should be "is" instead of "are".

Answer:

by fixing subject - verb agreement errors