Examlex
One of the functions of the placenta is to act as an endocrine gland.
Symmetrical Body Plan
A layout of an organism's body parts in a balanced distribution around a central line or point, allowing for the division into mirror-like halves.
Tissues
Groups of cells in an organism that have similar structure and function.
Mantle
In geology, the layer of the Earth between the crust and the outer core; in biology, a tissue that encloses the vital organs of mollusks and secretes the shell.
Mollusk Group
A diverse group of invertebrate animals that includes snails, clams, squids, and octopuses, characterized by a soft body that is often protected by a hard shell.
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