Put these in order from oldest to most recent. (earth’s history) bacteria, dinosaur, earth, moon, humans, oxygen, trees, food.

it is important to conserve water because there is very limited amount of freshwater here on earth and if we are not smart about how we use it we will only be runnning out of our supply faster than neccessarry.

explanation: it gains negative electrons, therefore becoming negatively charged. as charge cannot be created, nor destroyed, only transferred, this leaves the wool positive. now that they have opposite charges, the two items attract.

the answers would be

the first one and the second one

there are two significant figures.