Some apps you can use to find answers;
Socratic
Brainly
Photomath
Or search it up
The physical characteristics or what?
Answer: It is called DEMIFACET.
Explanation:
Demifacet is the half of the facet it is the medium heart shaped flat face where part of the head of rib or part of coastal cartilage articulates and it is usually found from rib 2 to 9. It is the superior of the demifacet that receive the head of the rib I.e the head articulate to it.
I may be wrong but i think that they are
1. turbines are added under the water and when the movement of water effects that is uses power to gather electricity
2. there are big barries in the water that spin the water around and then that in turn creates energy
Seedcoat protect the seed during unfavourable conditions.