Biology
Physics
Chemistry
Climate Change
100
Groups of cells that function together to perform specialized tasks.
What is tissues?
100
The type of image that can be shown is a real image.
What is the type of image that can be shown in a pinhole camera?
200
The smallest thing that has the characteristics of life. 
What is a cell?
200
A group of atoms that together have gained or lost electrons.
What is polyatomic ions?
200
Observed increase in Earth's average annual temperature.
What is global warming?
300
Any line that makes an angle of 90 degree to a reflecting surface.
What is a normal?
300
Absorption of thermal energy by the atmosphere, maintaining Earth at an average temperature suitable for life.
What is natural greenhouse effect?
400
Formed from actual light rays and can be shown on a screen.
What is a real image?
500
Nuclear division also know as cell division.
What is mitosis?
500
The hydrochloric helps you to break down your food in your stomach.
What is the acid in your stomach that helps you to break down your food?