Ques: Q: Cephalochordates have a notochord and nerve cord but not a? Choices: - digestive system - nervous system - brain - backbone A:
Ans: backbone

Ques: Q: What two types of atoms bond to form sulfate minerals? Choices: - oxygen and carbon - oxygen and calcium - carbon and sulfur - oxygen and sulfur A:
Ans: oxygen and sulfur

Ques: Q: What is the term for matter that does not let any light pass through? Choices: - dark - mirrored - reflective - opaque A:
Ans: opaque

Ques: Q: The components of what keep their own identity when they combine and can usually be easily separated? Choices: - alloy - solution - compound - mixture A:
Ans:
mixture