Respiration
What organ takes oxygen into the body?
Lungs
What word describes a substance that dissolves?
Soluble
What force pulls objects toward Earth?
Gravity
What is an ecosystem?
A community of living things and their environment
What is the center of an atom called?
Nucleus
What tiny air sacs are used for gas exchange in the lungs?
Alveoli
What is the liquid in a solution called?
Solvent
What is the formula for speed?
Speed = distance ÷ time
Name one adaptation of desert plants.
Thick stems, long roots, or waxy leaves
What is refraction?
Bending of light when it changes medium
What gas moves from the blood into the alveoli?
Carbon dioxide
Name one factor that can increase dissolving speed.
Heating, stirring, or crushing
What happens if forces are balanced?
No change in movement
What is an invasive species?
An organism introduced into a new ecosystem that causes harm
What is a balanced diet?
A diet containing all nutrients in correct amounts
Write the word equation for aerobic respiration
Glucose + oxygen → carbon dioxide + water + (energy)
What method is used to separate colors in ink?
Paper chromatography
What is the formula for pressure?
Pressure = force ÷ area
What is bioaccumulation?
Harmful chemicals building up in food chains
Write the general equation for metals reacting with water.
Metal + water → metal hydroxide + hydrogen
Explain the difference between breathing and respiration
Breathing is movement of air in and out of lungs, respiration is the chemical process that releases energy.
Why do different colors move different distances in chromatography?
Because substances dissolve and move at different speeds.
Why does pressure increase deeper underwater?
Because there are more particles pushing down.
Why is DDT dangerous in ecosystems?
It becomes more concentrated higher in the food chain.
Name one way to make an electromagnet stronger.
More coil turns, more current, or iron core