Here is a glossary of terms, for your convenience!
Niche: Term describing the position of a species or population in an ecosystem.
Copulation: This refers to when two animals undergo sexual reproduction and when the two sex organs meet.
Pharyngeal Slits: Found in chordates, during early development. They are gill-like structures used for feeding.
Lamellae: Comb like structures covered in tiny hairs for filter feeding.
Gizzard: A muscular pouch located at the end of the stomach.