Why did Mendel use pea plants in his experiments?

The earths core is made up mainly of what 2 substances? 2. like an egg, earth has a core, a layer surrounding the core, and a thin, hard outer layer. which layers of the earth match the layers of an egg?

What are the three groups of atoms that make up amino acids called

Sarah backstrokes at an average speed of 8 meters per second how long will it take her to complete the race of 200 meters length