Find the mistake.

Drought, rising temperatures and heat waves have been affected the food and water supply.

A. rising temperatures

B. heat waves

C. been affected

D. water supply

Choose the best answer.

The national park was established to ______ the ecosystem of the limestone forests.

Choose the best answer.

One of the factors that cause a species to become endangered is habitat ______.

Choose the best answer.

The ______ living by the river has been uprooted and then transported away.

The new varieties of rice grow well ______ in poor soil.

Choose the best answer.

Scientists have been studying different ecologies ______ the 20^th century.

Find the mistake.

The local farmers are trying to stop the invasive species from spreading for the past six months.

Find the mistake.

Scientists have been studying the elements that affect the develop of the native species.