Microglia are: 1. wandering white blood cells, function is immune defense.

2. forming myelin sheaths to insulate axons.

3. forming the blood brain barrier.

4. producing CSF

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Which of the following elements does soil need in the largest quantities to sustain plant life? a. copper b. iron c. nitrogen d. zinc

What statements describe a host organism?

Johnny rode his bike to a friend's house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was not able to play. what was his displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point