Only 1- the experiment can not show a cause and effect relationship if there are more than one factors contributing to the outcome.
Answer:
cilli and flagella
Explanation:
I think there is one more but not sure hope this helped
(also if spelling is weird sorry I tried)
Zipper fracking is a new technology that produces more oil and more gas, safely and effectively, all from rock formations. Well drilling is another way, you get clean, natural gas by drilling into wells that connect into the ground. All that being said, we could also get chemical energy to be more safer, more usable, more efficient, and cleaner, if people were not careless with their work.
