Jenny is trying to describe a wave. which example would be the best description?
toy car hitting a wall and bouncing back
toy car rear-ending a toy car that then rear-ends another toy car
toy cars driving parallel to each other at the same speed
toy cars driving away from each other at the same speed

Consider the model of the oxygen cycle on earth. the majority of earth's oxygen reservoirs are found in the a) atmosphere. b) biosphere. c) hydrosphere. d) lithosphere.

Sarah and john are having a discussion on genetic diversity. sarah believes that it happen over a long period of time. john it happens immediately. who is correct? a. sarah is correct because genetic diversity occurs over a long period of time. b. john is correct because genetic diversity occurs immediately. c. both are correct because genetic variation can occur or long period of time. d. neither are correct because genetic diversity occurs over any period of time

The cretaceous period spanned the time interval between and 65 million years ago. 250 million 144 million 75 million 200 million