The bear retreated to its ___________ to rest after a long day of foraging.

• Nest

• Burrow

• Den

• Hive

The ___________ balance of the forest is crucial for maintaining biodiversity.

• Economic

• Political

• Ecological

• Industrial

The dodo bird is a famous example of ___________ caused by human activities.

• Conservation

• Extinction

• Evolution

• Preservation

The island is known for its diverse ___________, attracting scientists from around the world.

• Weather

• Landscape

• Fauna and flora

• Urban areas

Advances in ___________ have allowed scientists to better understand the inheritance of traits in animals.

• Geology

• Genetics

• Astronomy

• Paleontology

Farmers often use ___________ to protect their crops from insects and other pests.

• Herbicides

• Fungicides

• Pesticides

• Fertilizers

The lion, as a top ___________, plays a vital role in maintaining the health of the savannah ecosystem.

• Prey

• Predator

• Cat

• Dog

The ___________ of deforestation include loss of habitat and increased carbon dioxide levels.

• Benefits

• Repercussions

• Advantages

• Improvements

The lush ___________ in the rainforest supports a wide variety of animal species.

• Climate

• Vegetation

• Geology

• Topography

Rats and other ___________ can cause significant damage to crops and stored food supplies.

• Pets

• Vermin

• Cats

• Dogs