*Question*
Q: What can be identified as an element, a compound, or a mixture? Choices: - waves - energy - light - matter A:
**Answer**
matter

*Question*
Q: Chordates are defined by a set of four characteristics that are shared by these animals at some point during their? Choices: - death - response - birth - development A:
**Answer**
development

*Question*
Q: Why do sodium and chloride ions attract each other? Choices: - sulfides attract - magnetism - like attracts like - opposites attract A:
**Answer**
opposites attract

*Question*
Q: Structures like the human tail bone and whale pelvis are called what? Choices: - primordial structures - parasitic structures - adaptations - vestigial structures A:
**Answer**
vestigial structures