Q: The motion of Earth is responsible for several celestial events. Which of the following events is caused by Earth revolving around the sun?

OPTIONS:
- the days in a year
- the hours in a day
- the changes in the atmosphere of Earth
- the position of the constellations in space
A: the days in a year
Q: When large areas of the rainforests are cleared and burned, climate can be affected. Which best explains how rainforest destruction can contribute to the greenhouse effect?

OPTIONS:
- by threatening native plants and animals
- by increasing the rate of soil erosion
- by increasing the water levels in oceans
- by releasing carbon into the atmosphere
A: by releasing carbon into the atmosphere
Q: The human body processes and eliminates food waste using the organs of the excretory system. Which organelle performs a similar function in humans at the cellular level?

OPTIONS:
- mitochondrion
- endoplasmic reticulum
- lysosome
- Golgi complex
A: lysosome
Q: Which best describes a characteristic of the jet stream?

OPTIONS:
- It forms a boundary between a cold air mass and a warm air mass.
- It creates the high winds around the eye of a hurricane.
- It forces the hot air along the equator to rise to areas in North America.
- It causes high pressure air masses to rotate clockwise.
A:
It forms a boundary between a cold air mass and a warm air mass.