Trees remove carbon dioxide from the air during photosynthesis. They also provide shade and homes for animals. Why are trees valuable to the environment? Use 2 supporting details from the text.

Exercise strengthens the heart and muscles. It can also improve mood and reduce stress levels. Why is regular exercise important? Use 2 supporting details from the text.

The Roman Empire built roads connecting cities across large distances. These roads improved trade and helped armies travel efficiently. Why were Roman roads important? Use 2 supporting details from the text.

Solar panels collect energy from sunlight and convert it into electricity. Many homeowners install them to lower energy bills and reduce the use of fossil fuels. Why do people install solar panels? Use 2 supporting details from the text.

Wind turbines use moving air to generate electricity. This energy source does not require burning fossil fuels. Why is wind energy useful? Use 2 supporting details from the text.

During the Industrial Revolution, factories increased the speed of production. Many goods became cheaper and easier for people to buy. Why was the Industrial Revolution significant? Use 2 supporting details from the text.

Hurricanes form over warm ocean water and bring strong winds and heavy rain. They can cause flooding and property damage. Why are hurricanes dangerous? Use 2 supporting details from the text.

Recycling paper reduces the number of trees that need to be cut down. It also decreases the amount of waste sent to landfills. Why is recycling paper beneficial? Use 2 supporting details from the text.

Coral reefs are home to many species of fish and sea animals. They also protect coastlines by reducing wave impact. Why are coral reefs important? Use 2 supporting details from the text.

Bees transfer pollen from one flower to another as they gather nectar. This process helps plants produce fruits, vegetables, and seeds. Why are bees important to plants and farmers? Use 2 supporting details from the text.

Mammals are warm-blooded animals that have hair or fur. Most mammals give birth to live young and feed them milk. What characteristics make an animal a mammal? Use 2 supporting details from the text.

The Great Wall of China was built to help defend against invasions. It also allowed soldiers to travel quickly across long distances. Why was the Great Wall important? Use 2 supporting details from the text.