What is the function of the spleen in the human body?

What is the term for the point in a planet's orbit where it is closest to the Sun?

What is the chemical formula for hydrogen sulfide?

What is the role of DNA in the cell?

Which of the following is a type of cloud that often forms a dark, towering structure and is associated with thunderstorms?

Which of the following is a common property of metals?

Which atmospheric layer is home to the Northern and Southern Lights (auroras) due to the interaction of charged particles with Earth's magnetic field?

Which of the following is not a function of the skeletal system?

What is the term for the point on the Earth's surface directly above the earthquake's origin, where seismic waves are first felt?

Which moon of Uranus is named after a character from William Shakespeare's play "A Midsummer Night's Dream"?