I believe the sunbird would benefit the plant because it would pollinate them. Going from flower to flower, pollen would get stuck on it's feathers and it would pollinate other flowers, like a bee.
Answer:
B) Binocular stereoscopic vision, grasping hands and feet, and nails on the toes and fingers all co-evolved to enhance visual predation on insects in the terminal branches of trees.
Explanation:
A characteristic of the primates, when they evolved was the replacement of the claws by ones, the binocular vision, which generated these two characteristics the option to see and take better the insects and fruit in high branches
A. Hormones
secreted directly into the blood
I studied this before and I'm pretty sure it's D (sorry if I'm wrong)