Examlex
Studies have shown that reducing the amount a person sleeps has no effect on blood levels of the hormones leptin and ghrelin.
Skeleton
The internal framework of bone and cartilage in vertebrates (including humans) that supports and protects the body while also aiding in movement.
Asymmetrical Body
A bodily form in which the left and right sides do not mirror each other in shape or size, uncommon among higher organisms.
Phylum
A rank in the biological classification system that is below kingdom and above class, grouping together organisms that share a common ancestor and basic body plan.
Porifera
A phylum of aquatic invertebrate animals that comprises the sponges, characterized by a porous body and a simple construction.
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