Life Systems
This body system transports oxygen and nutrients throughout your body.
what is the circulatory system
Ice, water, and steam are examples of these three states of matter.
What are solid, liquid, and gas?
This causes day and night on Earth.
what is the earth's rotation
Grass and trees belong to this category because they make their own food.
what are producers
what is the main job of the respiratory system
What is bringing oxygen into the body and removing carbon dioxide?
This type of change occurs when ice melts.
what is a physical change
Earth takes approximately this long to orbit the Sun once
what is one year
Animals that get energy by eating plants or other animals are called these.
what are consumers
This is the correct order food travels through the digestive system: mouth → ______ → stomach → small intestine → large intestine.
What is the esophagus?
Burning wood is an example of this type of change.
what is a chemical change
Earth takes approximately this long to rotate once on its axis.
what is 24 hours
Fungi and many types of bacteria perform this important role in ecosystems.
what are decomposers
Thick fur and a layer of body fat help this animal survive in extremely cold environments.
what is a polar bear
This type of energy is stored in food.
what is chemical energy
This, combined with Earth's tilt, is responsible for the seasons.
what is earth's revolution around the sun
Grass → grasshopper → snake → hawk is an example of this.
what is a food chain
If most insects disappeared from a forest, this could happen to birds and other animals that depend on insects for food.
What is their populations could decrease because they lose an important food source?
When you turn on a flashlight, chemical energy in the battery is transformed into this type of energy, which then produces light.
waht is electical energy
The Moon appears to change shape throughout the month because of this.
What are the changing positions of the Moon, Earth, and Sun affecting how much of the Moon's sunlit side we see?
If a major predator disappears from an ecosystem, populations of its prey may increase and cause changes throughout this interconnected system.
what is a food web