What is the basic structural and functional unit of life?

What is the term for the alignment of three celestial bodies, such as the Sun, Moon, and Earth, in a straight line?

In the human reproductive system, what is the function of the testes in males?

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

Which of the following is a function of the integumentary system?

What is the term for the circular movement of ocean water that is driven by wind, Earth's rotation, and differences in water temperature and salinity?

According to the law of conservation of momentum, what happens to the total momentum of a system of objects if no external force acts on it?

Which type of galaxy has a flattened disk structure with spiral arms and a central bulge?

What is the closest star to Earth?

What is the chemical formula for table sugar (sucrose)?