Invertebrates are a type of creature without a skeleton.

He is an expert in ethology, and his research is highly regarded worldwide.

He is studying about ancient animal worship.

As the name suggests, onychophorans are a unique group of animals that have claws.

He has a deep interest in paleozoology.

He is an expert in paleozoology and has a deep knowledge about the ecology of dinosaurs.

The Six-Tusked White Elephant is said to be a legendary creature.

The Y chromosome carries the genes that determine maleness.

I inherited my X chromosome from my mother.

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