Answer :
In 2003, Tyrone Hayes proposed that pesticides could be the cause of worldwide amphibian declines. This statement is an example of hypothesis.
Pesticides are the chemicals used to kill or slow the growth various pests and small insects in the farm fields. These pesticides can be harmful to other species as well. Pesticides are further divided into three types: insecticides, herbicides and fungicides.
Amphibians are the vertebrate animals that live in land as well as water. These are cold-blooded animals. Most of the amphibians have a moist skin and may have scales on their body. The example of amphibians are: toads, salamanders, newts, etc.
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