What words indicate Cause?
The words which indicate 'cause' from the paragraph include 'rapidly' and 'Irretrievably'. They can be said to be indicating 'cause' as they inform us of the rate at which the frogs are vanishing.
The thesis statement is formed by the words 'Frogs have thrived for nearly 200 million years. Now they are vanishing'. This sentence forms the thesis statement because it starts by informing us how the frogs have nurtured then it introduces the alarming fact concerning the amphibians.
Despite thriving for nearly 200 million years, the recent massive vanishing of frogs is been blamed on climate change, pollution and other factors. Among the effects associated with the decline of the number of frogs include lack of clear water due to increase of algae and there would be a massive number of insects since they act like food to the frogs. It is note worthy the frog population be kept at their normal and humans should reduce pollution of the environment. This is because the decline in the number of frogs will mean a 'swarm of insects' and we know how devastating that can be to the earth's vegetation cover. The decline in the number of Amphibians forced scientist world wide to converge in Atlanta Georgia and try to come up with ways of protecting the Amphibians from extinction. Among other methods resorted to conserve the frogs, captive breeding stood out as the main measure.