Which of the following factors made the land a place where the first land plants could thrive? Select the two correct answers. -evolution of animals
-low levels of oxygen in the atmosphere
-abundant sunlight for photosynthesis
-new, nutrient-rich soil made of cyanobacteria and deteriorating rock

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

Predict the results of a two base insertion or deletion in a strand of dna that codes for a protien, how does this differ from a three base insertion or deletion?

In the water cycle , when does water undergo a chemical change