The cambrian explosion resulted in the evolution of the first
a) dinosaurs and mammals
b)representative of most animal phyla
c)bacteria
d) land animals

Ans.(B). Represantive of most animal phyla.

Cambrian Explosion can be defined as an event that occurred around 541 million years ago, during Cambrian period and led to evolution of major animal phyla in fossil records.

It is known as Cambrian Explosion as it resulted in appearance of diverse life forms in a relatively short time.

Thus, the correct answer is option (B) .