<span>In a rat's digestive system mechanical digestion occurs in the mouth, stomach. Chemical digestion occurs at three points, which are: In the mouth starch is partially digested, in the stomach proteins are digested, and in the small intestine the rest of the food (but not fiber) is digested.</span>
sclerenchyma
Explanation:
sclerenchyma is a suppprting tissue that gives the plants rigidity and support to make it stand upright. It is made up of scleroids and fibre.
Scleroids are small stonelike materials that are arranged in a way that helps the plants withstand force.
For example when rain falls and the wind's current is strong, it sways the plant from left to right but because of sclerenchyma, the plant can withstand the current and return to its normal position. But if the winds current or force is stroonger than that of the sclenchyma, the plant bends or breaks
They have the least energy and longest wavelengths
This is an illustration of the reflex arc.