Q: You are presented with the quiz "Computers run when what is working properly?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "when an electrical circuit is working properly , electrical current runs through that circuit" and "currently computers run on electric circuits and wires". So, what's the best answer to the question?

OPTIONS:
- metal forks
- an engine
- lowered energy cost
- deoxyribonucleic acid
- plastic switches
- objects that have mass
- power ballads
- electrical circuit

A: electrical circuit

Q: You are presented with the quiz "What has a negative impact on an ecosystem?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "cutting down trees has a negative impact on an ecosystem" and "oak trees are so strong". So, what's the best answer to the question?

OPTIONS:
- massive damage
- Pesticides
- good weather
- Destroy bridges
- planting trees
- normal water levels
- deforestation
- cutting down oaks

A: cutting down oaks

Q: You are presented with the quiz "What is formed when testosterone is present?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "testosterone stimulates the reproductive organs to develop into male organs" and "if testosterone is present, male external genitalia develop b". So, what's the best answer to the question?

OPTIONS:
- competition
- Male genitalia
- Female genitalia
- layers of fat
- Downs syndrome
- Mental retardation
- fur and fat
- Chemical energy

A: Male genitalia

Q: You are presented with the quiz "When the Amazon floods it deposits what in flood plain?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "when a river floods , that river deposits soil in flood plains" and "by far the mightiest of the great rivers is the Amazon ". So, what's the best answer to the question?

OPTIONS:
- earth
- cities
- rocks
- dirt
- seawater
- Sand
- saltwater
- soil

A:
soil