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Define haemocoel. Name two groups of ani...

Define haemocoel. Name two groups of animals in which it is present.

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**Step-by-Step Solution:** 1. **Definition of Haemocoel:** - Haemocoel is a body cavity found in certain invertebrates. It is a type of pseudocoel (false coelom) where blood (or a blood-like fluid) is present. This cavity is filled with hemolymph, which serves as a medium for the circulation of nutrients and waste products. 2. **Characteristics of Haemocoel:** - Unlike true coeloms, haemocoels do not have a lining of mesodermal tissue. Instead, they are spaces within the body that allow for the movement of hemolymph, which is a fluid that functions similarly to blood in vertebrates but lacks hemoglobin. ...
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