B. I think thats right :/
2. To focus a microscope using the high power lens you must first in low power center the specimen and make sure it is in focus. Then switch to high power and adjust using the fine adjustment or the smaller knob.
3. It prevents dust from settling on the scope and in the lenses.
Answer: D. Regulate the thalamus
Explanation:
Answer:
it preserved and resourcefully used
