During winter animals sit into curl why

They do this to keep warm. Being curled up means they have less surface area exposed to the cold, so they lose heat more slowly.','.

the first american roller coaster was the mauch chunk switchback railway, built in the mountains of pennsylvania in the mid-1800s. the track, originally built to send coal to a railway, was reconfigured as a "scenic tour."

true is the correct answer

hope i