question:
When a balloon is filled with air and suddenly released, it will fly around the room as the air escapes. If compared to space transportation, the escaping air is most similar to what subsystem of a spacecraft?

answer:
propulsion

question:
Chromosomes contain the genetic information of an organism. Fruit flies reproduce by sexual reproduction. Most of the cells of a fruit fly have 8 chromosomes. Which statement best explains the source of the chromosomes in a normal fertilized fruit fly egg?

answer:
The sperm cell provides 4 chromosomes and the egg cell provides 4 chromosomes.

question:
Wind turbines are being used to generate electricity in many parts of the United States. One advantage of wind turbines is that no fossil fuels are burned. Which of the following is a disadvantage of wind turbines?

answer:
Wind turbine farms require a lot of area compared to how much energy they produce.

question:
Which disease is a result of abnormal cell division?

answer:
cancer