Bhak be

Animals are classified into various groups based on their physical characteristics, embryonic development, and genetic relationships. The broadest classification divides them into two categories:

Invertebrates: These animals lack a backbone. They make up over 95% of all known animal species. Examples include insects, worms, mollusks, and jellyfish.

Vertebrates: These animals have a backbone and an internal skeleton. They include:

Fish: Aquatic, gill-bearing animals that lack limbs with digits.