Which recent discovery led to a new understanding of how genetic mutations increase the risk of cancer?
a.) double helix structure of dna
b.) brca1 and brca2
c.) genes nucleic acid monomers
d.) chemical composition of proteins

Which of the following conclusions can be drawn

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

Up to what percentage of the world's flora consisted of cycads during the triassic period? 100% 75% 50% 20%