Answer:
Freshwater, Ocean Water, and Terrestrial.
Explanation:
These are the broadest 'three types of ecosystems' that come to mind.
Crust:outer silicate solid crust
mantle:highly viscous
core:solid inner core
Answer:
Costa Rica, Cuba, The Dominican Republic, El Salvador, Guatemala, Honduras, Mexico, Nicaragua, Panama, Puerto Rico, The United States has no official language, but since Spanish is widely spoken there, it is sometimes counted among the Spanish-speaking countries.
Explanation:
The current population of the United States of America is 325,372,521 as of Thursday, January 12, 2017, based on the latest United Nations estimates.
