The oxygen revolution changed earth’s environment dramatically. which of the following adaptations took advantage of the presence of free oxygen in the oceans and atmosphere? select one of the options below as your

a. the evolution of cellular respiration, which used oxygen to harvest energy from organic molecules.
b. the evolution of chloroplasts.
c. the persistence of some animal groups in anaerobic habitats.

If we compare and contrast electromagnetic waves with sound waves, all but one statement is true. that is a) sound waves require a medium to travel while electromagnetic waves do not. b) electromagnetic waves can travel through the vacuum of space while sound waves cannot. c) electromagnetic waves must have a medium in which to travel, but sound waves can travel anywhere. eliminate d) sound waves must bounce off of matter in order to travel while electromagnetic waves do not require matter to be present.

What 3 categories are elements divided

The lewis diagrams for magnesium and fluorine are shown below. what is the correct chemical formula for magnesium fluoride? a. mgf b. mg2f c. mgf2 d. mg2f3