Match the layers of the earth to their proper composition.
match term definition
inner core
a. solid iron
asthenosphere
b. liquid iron
lithosphere
c. solid rock
outer core
d. liquid rock

The deserts of the sahara and australia are associated with

Common commercial benefits of microorganisms include synthesis ofa. insulin. b. antibiotics. c. aspirin. d. antibiotics and aspirin. e. antibiotics and insulin.

Ialready know the answers to these questions and they are on the attachment. but i just need to know why that answer is the correct one. plz asap! this is for a report that i need to email by 10!