Naturalist: A person who studies or is interested in natural history.

Nitrous Oxide: A gas. It can be made by nature or by humans. It is s "Greenhouse gas". Forms of moisture; rain, snow, sleet, and hail.

Nocturnal: Active during the night.

Nonbiodegradable: Incapable of being broken down naturally into substances that will not harm the environment.

Nonrenewable: Nonliving resources (such as rocks and minerals, petroleum, coal, copper, gold…) that cannot be replaced, replenished, or renewed by natural processes or by human planning and practices.

Nutrients: Substances that are taken in by plants and animals to help them grow.

Nymphs: Baby bugs

Obesity: A condition describing excess body weight in the form of fat. Obesity is associated with many illnesses and can cause early mortality.

Omnivorous: Eating both animal and plant foods.

Organic: Related to living things; made by or gotten from plants or animals.

Organism: A living thing; a form of life, plant or animal.

Oxygen (O₂): A colourless, odorless, tasteless gas that is produced by plants and needed by animals, including people.

Ozone Layer: A layer of oxygen formed naturally, high above the Earth, which acts as a screen to protect plants and animals for the sun’s harmful ultraviolet rays.

Pesticide: A chemical poison that is used to kill pests, such as insects, rodents or weeds.

pH: A measure that indicates the relative acidity or alkalinity of a substance. The pH scale ranges from 0 (most acidic) to 14 (most basic), with a pH of 7 being neutral.

Photosynthesis: The method whereby plants use the energy of sunlight to change carbon dioxide and water into food (sugars) for themselves.

Plastic: The name given to a large group of substances made chemically from such materials as coal or oil mixed with water and limestone.

Pollutant: Any substance that can make air, land or water dirty or impure.

Porous: Full of or having holes.

Predator: An animal that hunts and kills other animals for food.

Prey: Any animal that is caught and eaten by another animal.

Processed: To change something with a series of steps. Example: crude oil has to be processed into different oil products before it can be used.

Produce: Fresh fruits and vegetable grown for the market; same as "crop."