Q: Einstein's equation helps scientists understand what happens in nuclear reactions and why they produce so much what? Choices: - light - food - hydrogen - energy A:
energy

Q: What is a gram stain used to identify ? Choices: - radioactivity - acids or bases - different types of liquids - different types of bacteria A:
different types of bacteria

Q: What is the raw material for evolution by natural selection called? Choices: - pattern variation - mutation - comparable variation - genetic variation A:
genetic variation