question #5: corals are sensitive to temperature . if temperatures are raised , it will cause the coral to bleach . what does bleach mean ? And can corals recover ?

What element breaks down into yttrium-90?

Transportation is the largest single source of air pollution in the united states. air pollution can harm the environment and human health. which technology could offer a solution to this problem? mufflers that reduce noise motors that run on electricity tires that improve gas mileage

Which other elements contain the same number of outer electrons as sodium