Question: Q: Contributing to the blood-brain barrier is one of the jobs of glial cells, which support neurons in what system? Choices: - peripheral nervous system - circulatory system - digestive system - central nervous system A:
Answer: central nervous system

Question: Q: Fine-grained mud in the deep ocean comes from silts and clays brought from the land by? Choices: - fire - water - waves - wind A:
Answer: wind

Question: Q: What type of plant is the dominant group of land plants? Choices: - grass plants - oxygen plants - thermal plants - vascular plants A:
Answer:
vascular plants