Which of the following is true of annelids? a) They have a gastrovascular cavity. b) They have an open circulatory system. c) They have a nerve net. d) They have pseudocoeloms. e) They perform gas exchange across their skin.

e) They perform gas exchange across their skin.

Explanation:

Annelids are organisms which are invertebrates and are worms. Examples

Include earthworm, rag worm and leeches.

They don’t have a gastrovascular cavity. They don’t have an open circulatory system, instead it operates on a closed circulatory system.They lack pseudocoeloms which is the space between the endoderm and mesoderm. They however exchange gases through their moist skin.

you can have just about every answer you can think of

not necessarily. higher fitness requires the organism to be reproductive successful. for example, an organism at age 10 with 15 offspring is much more fit than an organism at age 15 with only 5 offspring.