Large-scale environmental catastrophes
a. result from human activities
b. have a negative impact on ecosystems
c. affect a variety of environmental factors
d. all of the above

Ray lo bisects nlm, lm=18, no=4, and ln=10. what is the value of x?

Ascientist is explaining how background cosmic radiation gives evidence of the big bang theory. she says that radiation has been detected everywhere equally as heat in the universe and is increasing. this has been shown to be residual radiation from the big bang. what error did the scientist make?

Fossils of glossopteris, an extinct fern, were discovered on which continents to support the theory of continental drift? check all that apply.