Physics
Chemistry
Environmental Science
Biology
100

unit for velocity

m/s

100

Molecular formula for carbon dioxide

CO2

100

This process takes in light and water to form glucose in plants 

Photosynthesis

100

Powerhouse of the cell

Mitochondria

200

Force that pulls us down

Gravity

200

Bond between a metal and nonmetal

Ionic

200

This element makes up 21% of the atmosphere and sustains life

Oxygen

200

DNA stands for 

Deoxyribonucleic Acid

300

Force over area

Pressure

300

Balanced on the pH scale

7

300

This protects us from UV radiation

Ozone layer

300

Number of amino acids

20
400

Density of water

1000 kg/m3

400

A reaction that absorbs heat energy

Endothermic

400

This cycle includes bacteria, nitrite, nitrate, and ammonia

Nitrogen cycle

400

Macromolecule made of C, H, O, N, and S

Protein

500

Unit for work (fully expanded)

kg*m2/s3

500

Avogadro's number

6.02 x 1023

500

This chemical causes ocean acidification

Carbonic acid (H2CO3)

500

Sections of eukaryotic DNA that are cut out and not expressed

Introns