A science teacher asked students to describe and explain an internal adaptation that allows for a specific function. Students wrote the following: Student 1: Leaf frogs can change their appearance to match their surroundings.
Student 2: Birds have hollow bones, enabling them to fly.
Student 3: Penguins live together in groups.
Student 4: Musk ox have thick, shaggy hair to protect them from cold temperatures.

Which student’s answer describes and explains an internal adaptation that allows for a specific function?
A - Student 1
B - Student 2
C - Student 3
D - Student 4