Choose the verb form that correctly completes the sentence. Why_? you at work yesterday?
wasn't
aren't
weren't
isn't

Look at the following answer choices and determine which belongs in the both category. testable, can be disproven explains natural phenomena, has evidence to support it prediction, tentative, one or more scientists working together well established, many different scientists working independently, highly reliable

Environmental science are unconsidered with methods to preserve natural resourcesa.trueb.false

Isotopes of the same element have differ in their