Hair follicle: A small cavity surrounding the root of a hair.

Harvest: To collect or gather.

Herbivore: A plant-feeding animal.

Heredity: Physical features passed from parent to offspring through genes.

Hibernation: A period of inactivity during the winter.

Hormones: Chemicals that circulate in the blood that stimulate tissues and organs.

Hydrozoans: A group of water-dwelling organisms without backbones that includes jellyfish.

Hypermetamorphosis: Development of insect larvae that have two or more distinctive body forms.

Instar: The stage between molts in arthropods.

Invertebrate: An animal without a backbone, such as an insect or earthworm.

Invertebrate zoologist: A scientist who studies animals without backbones.

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