Which one of these exhibits a notochord at some stage in its development. a. a cat b. a hydra c. a brittle star d. a tapeworm

The correct answer option is A. a cat.

Explanation:

From the given options, a cat is an animal which exhibits a notochord at some stage in its development.

Cats, being a mammal, have backbones which puts them in the category of phylum Chordata and the subphylum Vertebrata. The chordates, unlike the members of other phyla, have a notochord which is formed during some stage of their development to support the body.

you are the source of the heat energy. you can minimize the heat energy by selecting the appropriate clothes to wear.

answer:

sequence 1- deletion

                  2- duplication

                  3- insertion

                  4- substitute

                  5- inversion