I feel like it is D.......
The muscular system helps move blood, and keep your posture upright, the skeletal consists of the ligament, tendon, joins, and muscular the muscle. They work together to relax and contract with each other.
B) Deforestation
The area they are living in becomes smaller and they are forced to fight for resources, enter urban settings, and as the forest declines they are more likely to encounter predators.
I would say the answer is D
