Which of the following is NOT a function of the digestive system?

• Breaking down food into molecules the body can use
• Absorb molecules into the blood and carry them throughout the body
• Food allows blood cells to flow through arteries and veins
• Eliminate waste

If food is in the esophagus, which letter represents where it will go next in the digestive system?  

• B
• C
• D
• E

Consider the food chain:
grass >>> insect >>> frog >>> snake
Which is the 3rd level consumer?

• grass
• insect
• frog
• snake

What two types of particles exist within an atomic nucleus?

• protons and neutrons
• Neutrons and electrons
• Protons and neutrinos
• Positrons and neutrons

Carbon has an atomic number of 6. What can you conclude about carbon from this fact?

• It has six protons
• It has six neutrons 
• It's in group 6
• It's in period 6

To become positively charged, an atom must:

• Gain a proton
• Lose a proton
• Gain an electron
• Lose an electron

How many neutrons does the isotope of lithium have?

• 8
• 3
• 4
• 5

Ions are: 

• atoms with a positive or negative charge
• atoms with no charge
• atoms with ONLY a positive charge
• atoms with ONLY a negative charge

Which of the following is a REACTANT of photosynthesis?

• Oxygen
• Carbon dioxide
• Sugar
• Heat

Exothermic reactions...

• Absorb energy
• Release energy
• Release Color
• Absorb Color