Q: Descending fibers from the cerebrum have branches that connect to neurons in the pons. those neurons project into the cerebellum, providing a copy of motor commands sent to this? A:
OPTIONS:
- neurotransmitters
- umbilical cord
- cerebral cortex
- spinal cord

Answer: spinal cord

Q: Spiders use the hydrostatic pressure generated by an open type of what anatomical system to extend their legs? A:
OPTIONS:
- respiratory
- pulmonary
- vascular
- circulatory

Answer: circulatory

Q: In what form is most of the earth's freshwater? A:
OPTIONS:
- gas
- liqued
- steam
- frozen

Answer:
frozen