Answer:
Grasslands. Grassland support numerous species. The grass provides feeding of vegetations for animals on savannas. Such as, zebras wildebeest, gazelles, and giraffes.
Explanation:
1) Learn the way/what animals eat
2) Learn more about humans to solve/cure diseases
3) To increase intelligence
4) Saftey of Earth (humans,animals,plants,etc.)
The amplitude of S waves do not decrease as the depth increases while Vertical waves do.
The purpose is to show North,South, East, and West. Sometimes it shows northwest,northeast,southwest, and southeast as well.