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.
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The animal agriculture industry is killing our environment and putting every species on this planet at risk of extinction. The animal agriculture industry's pollution of our air, water and land, along with deforestation and soil degradation, all contribute to habitat loss and species extinction.
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<h2>Source of Light in Universe</h2>
<h3>Although the Sun doesn't light up the other stars, it does provide the daylight here on Earth; and the moon and planets we see are illuminated by that same sunlight. All stars produce light (and other kinds of energy) through nuclear reactions, using the energy stored in the tiny nucleus at the center of atoms.</h3>
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