1. Changing (increasing or decreasing) as an individual's age increases

See also: related, related to

• family Neritidae
• family Nidulariaceae
• family Nitrobacteriaceae
• family Noctuidae
• family Nostocaceae
• family Notonectidae
• family Notoryctidae
• family Nummulitidae
• family Nyctaginaceae
• family Nymphaeaceae
• family Nymphalidae
• family Nyssaceae
• family Ochnaceae
• family Ochotonidae
• family Octopodidae
• family Odobenidae
• family Odontaspididae
• family Oedogoniaceae
• family Oestridae
• family Ogcocephalidae
• family Oleaceae
• family Oleandraceae
• family Onagraceae
• family Oniscidae
• family Ophidiidae