Answer:
could've
Explanation:
Could've is a contraction of could have. You need this irregular verb "have" to form a complete and correct sentence.
The answer is: Echinoderms.
Echinoderm is the name given to marine animals whose adults are acknowledged to possess usually five-point radial symmetry, which is the balance of distribution of body parts and shapes. They are also found at the ocean bottom, so there are no land versions of echinoderms. Besides sea cucumbers and sea lilies, other examples of echinoderms include sea stars, urchins and sand dollars.
<span>being dramatic
Indefinitely means that something could last forever, so Bertie is being dramatic by saying he could speak about this topic without ever stopping. Clearly the topic means a lot to him and he has many thoughts and opinions on aspects of it. </span>
