Q: In studying energy, what term do scientists use to refer to the matter and its environment involved in energy transfers? Choices: - molecule - ecosystem - world - system A:
system

Q: What are the nonliving matter that living things need called? Choices: - fluids - elements - acids - nutrients A:
nutrients

Q: What evolutionary concept emphasizes reproductive isolation? Choices: - chemical species concept - toxic species concept - reproductive method concept - biological species concept A:
biological species concept