Question

which important event in earths history occurred during the jurassic period? the first birds emerged on earth. mammals were in search of food. animals with shells emerged on earth. treelike ferns first began to grow and populate.

Explanation:

The first birds, Archaeopteryx, emerged during the Jurassic period. Mammals were present but not specifically characterized by searching for food as a defining - event of the Jurassic. Animals with shells emerged much earlier. Treelike ferns also appeared before the Jurassic.

Answer:

The first birds emerged on Earth.