What are the advantages of ground water

ground water generally does not get polluted because it out of reach from people who would pollute it. while percolating through sand & stones it acts as a natural filter so groundwater remains pure and clean.

The answer is (b.) transitional fossils

the punctuated equilibrium theory proposes that a specie that appears in the fossil record will become stable. to support this theory, a fossil record serves as an evidence which includes transitional fossils. transitional fossils refers to the remains of an organism that still exhibit traits to both the ancestral and descendant group.