Answer:
1. Smooth endoplasmic reticulum are agranulated , doesn't contain Ribosomes while rough endoplasmic reticulum are granulates contain Ribosomes.
2. Ligament is a fibrous connective tissue which attaches bone to bone, and usually serves to hold structures together however tendon attach muscle to structure.
3. Involuntary muscles are those muscles whose activity is independent and not affected by voluntary nerve activity and controlled by autonomic nervous system. Foe example: smooth muscle and cardiac muscle.
4. a.Regulate water movement by transpiration.
b. Gas exchange...in which carbon dioxide (CO2) intake and releasing the Oxygen (O2) that we breath.
Hope this helps you...