How have invertebrates evolved?


Rate This Answer

Invertebrates resembling sponges and jellyfish were the first multicelled forms that began to appear in the fossil record around 570 million years ago (during the Cambrian Period). Since then, they have evolved into fish, amphibians, reptiles, birds, and mammals. The first invertebrates evolved from single-celled, food-eating microorganisms. ChaCha!

Answered -

Galleries

See All Galleries »

Weirdest Flowers

Weirdest Flowers

Viewed 91 times

Ridiculous Tombstones

Ridiculous Tombstones

Viewed 3,787 times

Left-Handed Celebrities

Left-Handed Celebrities

Viewed 427 times

Related Questions

View More »

Comments

Advertisement