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The three main worm phyla are flatworms, roundworms, and segmented worms. Roundworms have a digestive tube that has two openings. Segmented worms have a closed circulatory system in which blood is enclosed in blood vessels. These are important steps in the evolutionary development of animals.
<span>They have various isomer structures often either open chain or cyclic isomers that readily interchange structures. </span>
Explanation: If the rate of photosynthesis increases, then the number of bubbles will increase.
