The fossil record shows that the average size of black bears was large during cold glacial periods and got smaller during warmer time periods. what is this an example of?
directional selection
disruptive selection
sexual selection
stabilizing selection

The images show fossils of a modern bird and two extinct organisms (a tyrannosaurus rex and an archaeopteryx). based on the structure of the three organisms, it can be concluded that . the archaeopteryx and bird have wings, while dinosaurs have limbs. so, it can be concluded that .

Researchers want to use edna to look for an invasive species in the water which of the steps would be likely do last

Land conservation is a worldwide priority. there are several methods to prevent the loss of land due to a variety of reasons. which method is not a way to conserve land? a) sea walls b) rainwater harvesting c) limits on clear cuts of forests d) cut and burn methods of clearing land