Examlex
The heart and blood vessels are the primary organs of the ________ system.
Morula
An early embryo consisting of a solid ball of cells.
Gastrula
A three-layered embryo formed by the process of gastrulation.
Acrosomal Net
A structure in certain sperm cells, derived from the acrosome, that plays a role in fertilization by penetrating the egg's outer layers.
Fertilization Cone
A structure formed at the tip of a sperm cell or pollen tube that facilitates the fusion of the male gamete with the female gamete.
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