The cells carrying out cellular aerobic respiration in humans obtain oxygen from

Select the correct answer from each drop-down menu proteins are

Which of the following is an eon in the time scale? phanerozoic proterozoic archean all of the above

Select the correct answer from each drop-down menu the images show fossils of a modern bird and two extinct organisms (a tyrannosaurus rex and an archaeopteryx). based on the structure of the three organisms, it can be concluded that the archaeopteryx and bird have wings, while dinosaurs have limhe se it can be concluded that