Which statement best explains why invertebrates often have outer skeletons but vertebrates do not?

The rate at which molecules water and oxygen can enter a cell is determined by the-

Me with biology endocrine system crossword also image left i need with hw

The picture shows a location in india that is very dry and arid. notice the tall mountains in the background; you can find high amounts of vegetation on the other side of the mountains. which statement is most likely true for this area?