What role does lightning play in the nitrogen cycle?

Which of the following correctly describes the relationship between the Earth and the Moon? A. The Moon orbits the Earth. B. The Earth orbits the Moon. C. none of these D. The Earth does not orbit the Moon and the Moon does not orbit the Earth.

The female sex cells or eggs are produced by

Discuss why scientists know so little about Precambrian Earth

Internal fertilization is a sexual reproductive strategy used by most terrestrial animals

A scientist completes a new investigation and announces that she has developed a new theory. Which of the following statements is most likely true about her investigation A. She discovered a law of science B. She has consensus on a new theory C.

How many kingdoms are in the modern system of classification?

One cell that undergoes meiosis will yield how many independent cells

What type of macromolecule is the sugar fructose?

DNA uses, while RNA uses.

How does pollution affect land, air, and water?