Q: What consists of thylakoid membranes surrounded by stroma? Choices: - a photon - a nucleus - a stem - a chloroplast A:
a chloroplast

Q: What is the force of attraction between fundamental particles called quarks, called. Choices: - magnetism - gravity - weak nuclear force - strong nuclear force A:
strong nuclear force

Q: What process would be impossible without some variation in the inherited traits of organisms within a species? Choices: - environmental selection - darwin's selection - characteristic selection - natural selection A:
natural selection