The oldest known fossils Group of answer choices all of the choices. are microscopic. are that of prokaryotes. date back 2.5 billion years ago.

Cyanobacteria from Archaean rocks of western Australia, dated 3.5 billion years old. Cyanobacteria are among the easiest microfossils to recognize

Explanation:

what statement best describes the difference between the sympathetic and parasympathetic nervous systems?

the sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response. the parasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions.