Which statement is true about invertebrates? A) They have endoskeletons. B) They reproduce only asexually. C) They are all aquatic. D) They all require oxygen.

The closest answer is A). B) is false because they reproduce sexually, C) is false because even though there are sea urchins, there are snails too. And D) is false because..well...sea urchins breathe water and snails breathe air. So A) is the only reasonable option. I hope this helped.

The answer is A they have endosketons