rubisco incorporates co2 from the atmosphere into an organic molecules
Homologous structure are body parts that are similar to each other. They are almost the same, but not quite. That's how the meanings are similar.
Answer: There are three classes. These classes include Calcerea, Desmospongia, and Hexactinellida. They are divided into these classes based mostly on the composition of their spicules and skeletal fibers. (spicules are rod-shaped cellular projections that make up the skeleton of sponges) hope this helps!
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