"fifteen hundred years ago everybody knew the earth was the center of the universe. five hundred years ago, everybody knew the earth was flat, and fifteen minutes ago, you knew that humans were alone on this planet. imagine what you’ll know tomorrow.” agent kay's statement illustrates that theories are a) always true. b) constantly changing. c) describe what happens in the natural world. eliminate d) are proven by evidence collected by scientists.

The skeletal system performs a variety of functions that are crucial to maintaining life processes. what function is performed in the bone marrow, but not in the ossified bones of the skeleton? a oxygen transportation c mineral storage b. muscle attachment d red blood cell production

How does a lytic infection differ from a lysogenic infection?

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