The protein channel illustrated in model three is a ligand gated channel. what must occur for the gate to open and allow movement of ions across the membrane?

answer:

the ligand must bind to a target protein to move ions across the membrane.

animals that live in temperate woodlands, the arctic, tundras, and other forest animals such as wolves,, bears, and chipmunks have large amounts of fur and store large amounts of body fur for hibernation purposes.