As we've learned so far, the popular model of the solar system shifted over time from geocentric (or Earth centered) to heliocentric (or sun centered).
What role do you think technology played in this shift?
What types of astronomical tools not available to early scientists who
supported the geocentric view helped thinkers in the 16th century and beyond
develop the heliocentric model?

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i think that d. wind is the answer.   i missed the question when i answered a. currents.

bacteria could be both, harmful and to us. harmful bacteria could make us sick and probably even by getting the chances of getting a disease, but good bacteria fight it off with your immune system. there is always bacteria everywhere we go. we need to make sure to wash our hands after using the restroom, before eating, after eating, after petting an animal too. so you see, bacteria is everywhere and is harmful or . i hope this . : ) : ) : )