A/an is type of research that involve observation and collecting data but does not include a control

2. this rock sample is limestone and shale. with what you know about rock formation, what type of environment did these organisms live in?

answer; i believe the correct answer is revolution)

the answer is option c.

explanation:

recycled water alludes to the water that being utilized again after it already  used for farming purposes.   this kind of water frequently contains pharmaceutical gathering due to the compound compost that is utilized for the plants is consumed into the water.