What is the name for a large, bowl-shaped depression in the Earth's surface, often caused by the impact of a meteorite?

What is the function of the respiratory system in the human body?

Which of the following is a fossil fuel formed from the remains of ancient marine organisms?

What is the primary gas in Earth's atmosphere?

What is the function of the nucleus in a cell?

Which of the following is an example of a polymer?

Which type of cloud is thin and wispy, found at high altitudes and composed of ice crystals?

What is the primary function of the cell membrane?

What type of mountain is formed by the folding and uplift of rock layers along tectonic plate boundaries?

Which blood type is considered the universal donor?