How is relative-age dating used to determine the ages of fossils? -by observing the formation of sedimentary rocks -by using radioactive isotopes -by estimating the number of fossils in a particular region -by the formation of igneous rocks -by identifying the way the fossils were formed

Fossils are the preserved remains or traces of animals, plants, and other organisms from the past. Fossils are important evidence for evolution because they show that life on earth was once different from life found on earth today.

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.

answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;