middle school
This is the process by which green plants use sunlight to make food from carbon dioxide and water.
What is photosynthesis?
The measure of how fast something moves in a given direction is called this.
What is velocity?
The smallest unit of an element that still has the properties of that element.
What is an atom?
The part of the cell that controls its activities and contains genetic material.
What is the nucleus?
This organ pumps blood throughout the human body.
What is the heart?
The solid, rocky layer of Earth that includes the crust and upper mantle is called this.
What is the lithosphere?
This simple machine uses a flat, slanted surface to make lifting easier.
What is an inclined plane?
This chart organizes all known elements by atomic number.
What is the periodic table?
These are the basic structural and functional units of all living things.
What are cells?
The largest organ of the human body.
What is the skin?
This layer of the atmosphere contains the ozone layer, which protects Earth from UV radiation.
What is the stratosphere?
The law stating that an object in motion stays in motion unless acted upon by an external force is part of this scientist’s three laws.
Who is Isaac Newton?
A substance made of two or more elements chemically combined is known as this.
What is a compound?
The process by which organisms maintain a stable internal environment.
What is homeostasis?
The part of the brain responsible for balance and coordination.
What is the cerebellum?
This is the smallest unit of life that can carry out all life functions.
What is a cell?
This is the force that pulls objects toward each other due to their mass.
What is gravity?
When a solid forms from two liquids during a chemical reaction, that solid is called this.
What is a precipitate?
This molecule carries genetic instructions for the development and functioning of living organisms.
What is DNA?
These blood vessels carry blood away from the heart.
What are arteries?
Animals that can live both on land and in water are classified in this group.
What are amphibians?
The amount of energy an object has due to its motion is called this.
What is kinetic energy?
The process of balancing equations ensures that this law is obeyed.
What is the Law of Conservation of Mass?
The process by which organisms that are better adapted to their environment survive and reproduce more successfully.
What is natural selection?
This system produces hormones that regulate growth, metabolism, and reproduction.
What is the endocrine system?