Examlex
Natural selection takes place at both the individual level and various group levels.
Medusa
A jellyfish-like animal; a free-swimming, umbrella-shaped stage in the life cycle of certain cnidarians. Compare with polyp.
Planula
The free-swimming, ciliated larva form of certain cnidarians, such as jellyfish, before it settles on a surface and develops into a polyp.
Miracidium
A free-swimming larval stage in the life cycle of certain parasitic flukes, hatching from eggs and infecting the first intermediate host, typically a snail.
Polyp Colony
An aggregation of many individual, yet genetically identical, polyps that are connected, forming organisms such as corals.
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