Which group of organisms do some scientists hypothesize first evolved as a result of the environmental conditions that existed on early precambrian earth? a. aerobic eukaryotes b. anaerobic prokaryotes

The sketch shows a rynchosaur, an extinct animal that is known only from fossils. there has been much debate about the classification of these creatures. some scientists suggest that they belong with primitive amphibians, and some think they are related to snakes and lizards.the data equally support both cases. which statement best explains how to draw a cladogram that includes the rynchosaur? draw the cladogram for amphibians. draw the cladogram for reptiles. draw two cladograms, both showing the traits, and leave it as a hypothesis. draw two cladograms, both showing the traits, and have scientists vote

Methane gas created by a cows flatulence especially in a large herd is a greenhouse gas. true or false.

The most famous fossil called archaeopteryx is which of the following? a dinosaur a fern a fish a bird