Choose the sentence that best combines each pair of sentences given.

Fossil fuels come from dead plants and animals. These plants and animals died millions of years ago.

Deforestation and loss of habitat threaten many species so that they will become extinct.

Many species lost their habitat because of deforestation and now they are extinct.

Deforestation and loss of habitat are driving many species to the verge of extinction.

Many species are extinct, so they run the risk of deforestation and loss of habitat.

It is alarming that deforestation damages the quality of the land.

The quality of the land deteriorates as the result of the alarming rate of deforestation.

The alarming rate of deforestation results from damage to the quality of the land.

The damage to the quality of the land is to blame for the alarming rate of deforestation.

The environment has been made catastrophic by global warming.

It is true that global warming is a catastrophe caused by the environment.

It has been proven that global warming is harmful to the environment.

The environment has been truly dangerous because of global warming.

Because of releasing a large amount of carbon dioxide, motor vehicles run on petrol.

A large amount of carbon dioxide emission results from motor vehicles running on petrol.

A large amount of carbon dioxide emission causes motor vehicles to run on petrol.

Emitting a large amount of carbon dioxide is one of the responsibilities of motor vehicles running on petrol.

Some animals go extinct due to changes in climate where they live.

Climate changes make some animals go extinct where they live.

The climate changes where some animals there go extinct.

That some animals go extinct causes the climate where they live to change.

Cutting down energy use is the only way to reduce global warming.

Global warming is among many ways to cut down energy use.

Helping reduce global warming is a way to cut down energy use.

Cutting down energy use is one of the ways to reduce global warming.

Animal habitat loss is increased with how polluted the environment gets.

When the environment gets more polluted, more animals will lose their habitats.

Because the environment gets more polluted, more animals will lose their habitats.

Increasing environmental pollution have resulted in more animal habitat loss.