What is common in the vital activity of protists and hydra? What can this community testify to?

Like protists, hydra has a cellular structure; they also belong to eukaryotes. They live in the aquatic environment. Both hydra and protists can reproduce asexually, and hydra gametes also resemble flagellates. By type of food – heterotrophs. They have similar breathing processes.
General signs may indicate that coelenterates evolved from protozoa, in the course of evolution they became more complex and became more highly organized organisms.

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