How did amphibians adapt to their changing environment ? A. They hibernated for many months in the winter .

B. The developed lungs and limbs .

C. they play dead to trick predators .

D . They developed fin and gills .

Glass has a hardness that is in the middle of the hardness scale. what is the hardness of glass?

It's a snowy day and you're pulling a friend along a level road on a sled. you've both been taking physics, so she asks what you think the coefficient of friction between the sled and the snow is. you've been walking at a steady 1.5m/s, and the rope pulls up on the sled at a 32 ∘ angle. you estimate that the mass of the sled, with your friend on it, is 65 kg and that you're pulling with a force of 80 n .

Which of the following list the divisions of the geologic time scale in order from longest to shortest