Question:
What two gases make up most of the Earth's atmosphere?
Answer:
Oxygen and nitrogen
Question:
Which of the following structures is not present in animal cells?
Answer:
cell wall
Question:
Many areas of Massachusetts have small deep ponds called kettle ponds. Which of the following best explains the formation of these ponds?
Answer:
glacial depression
Question:
In one of the steps of the carbon cycle, a person exhales a molecule of carbon dioxide (CO2) into the atmosphere. Which of the following is most likely to happen next to the atom of carbon in this molecule?
Answer:

It may be used as part of a sugar in a plant.