*Question*
Q: What can be identified as an element, a compound, or a mixture? Read this paragraph and choose the correct option from the provided answers: Matter 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? Read this paragraph and choose the correct option from the provided answers: Chordates are defined by a set of four characteristics that are shared by these animals at some point during their development. In some chordates, all four traits are present in the adult animal and serve important functions. However, in many chordates, including humans, some traits are present only during the embryonic stage. After that, these traits may disappear. Choices: - death - response - birth - development A:
**Answer**
development

*Question*
Q: Why do sodium and chloride ions attract each other? Read this paragraph and choose the correct option from the provided answers: Sodium and chloride ions have equal but opposite charges. Opposites attract, so sodium and chloride ions attract each other. They cling together in a strong ionic bond. You can see this in row 2 of Figure above . Brackets separate the ions in the diagram to show that the ions in the compound do not share electrons. You can see animations of sodium chloride forming at these URLs:. 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? Read this paragraph and choose the correct option from the provided answers: Structures like the human tail bone and whale pelvis are called vestigial structures . Evolution has reduced their size because the structures are no longer used. The human appendix is another example of a vestigial structure. It is a tiny remnant of a once-larger organ. In a distant ancestor, it was needed to digest food. It serves no purpose in humans today. Why do you think structures that are no longer used shrink in size? Why might a full-sized, unused structure reduce an organism's fitness?. Choices: - primordial structures - parasitic structures - adaptations - vestigial structures A:
**Answer**
vestigial structures