Which layer of the earth can have faults form?

a. mantle
b. asthenosphere
c. core
d. crust

An atom of nitrogen had seven protons in its nucleus. how many electrons does it have

Name the glands associated with human digestive system

What molecules will be best used to compare different species with the exact same sequence of amino acids? why would two species have the same protein even if the molecules in question is different? (hint: transcription to translation to protein).