1. Tardigrade
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  4. Absence of circulatory system in Hydra is compensated by

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Q. Absence of circulatory system in Hydra is compensated by

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Solution:

Hydra has a central cavity called gastrovascular cavity which is surrounded by the body wall. Mouth leads into this cavity which also extends into tentacles as their lumen. Digestion of food occurs in this cavity (extracellular digestion). Soluble products of digestion are distributed by the gastrodermal cells of this cavity. These cells get detached and move freely to distribute the digested food to all parts of the body.