Q: The addition of electron gives the halide ions the same electron configuration as what gas? A:

OPTIONS:
- a flammable gas
- a fatty gas
- an inert gas
- a noble gas

Answer: a noble gas

Q: What is considered to be a unique feature of echinoderms? A:

OPTIONS:
- oil vascular system
- air vascular system
- iron vascular system
- water vascular system

Answer: water vascular system

Q: In the lens makers' equation, diverging lenses and virtual images are associated with what kinds of numbers? A:

OPTIONS:
- positive numbers
- variable numbers
- fractional numbers
- negative numbers

Answer: negative numbers

Q: The fossil record indicates that anthropoids began diverging from other primates about how many million years ago? A:

OPTIONS:
- 70
- 40
- 60
- 50

Answer:
50