The lecture you were listening to is over. the bell that rang in the hall signaled the end of class. you get up out of your seat, pick up your things, and walk out the classroom door. which kind of nerves sent the signals from your brain to initiate your physical movements?

stratosphere: as the altitude increases, the air temperature increases. the stratosphere has a layer of ozone, called the ozone layer. this layer absorbs most of the ultraviolet radiation from sunlight. this results in the stratosphere being warmer.

an adaptation is a change or process by which an organism takes to be better suited for its environment. for example; migration is a behavioral adaptation, this is needed because birds are not built to last extremely cold climates. there are different adaptations because there are different species needing to adjust to different things, bears don't migrate; they hibernate.