Weather balloons are often used to make measurements in which "sphere"?

What type of competition exsist between two species. turtles and fish

Prokaryotic and eukaryotic cells are different in many ways other than the presence or absence of a nucleus. if both archaebacteria and eubacteria are prokaryotic cells, then why are archaebacteria more closely related to eukaryotic cells than they are to eubacteria?

Which step is the same in both forms of fermentation, as well as in cellular respiration?