Amphibians: A group of animals that includes frogs, salamanders, and caecilians. Amphibians have backbones and can breathe through their skin. Unlike reptiles, birds, and mammals, fetal or unhatched amphibians do not develop inside a special protective pouch called an amniotic sac.
cell: (biology) The smallest structural and functional unit of an organism. Usually too small to be seen with the naked eye and composed of a watery fluid surrounded by a membrane or wall. Animals are composed of thousands to trillions of cells, depending on their size. Most organisms, such as yeasts, molds, bacteria, and some algae, are composed of only a single cell.
chemicals: A substance formed by the combination of two or more atoms in a certain ratio and structure. For example, water is a chemical formed by two hydrogen atoms combined with one oxygen atom. Its chemical formula is H2O. Chemical can also be used as an adjective to describe the properties of substances that result from various reactions between different compounds.
Chemical reaction: A process that involves a rearrangement of the molecules or structure of a substance rather than a change in physical form (such as from solid to gas).
Ectotherms: A term used to describe animals that use an external heat source to regulate their body temperature, meaning that their body temperature changes as the temperature of their environment changes.
environment: The sum of everything that exists around some organism or process and the conditions that those things create. Environment can refer to the weather or ecosystem that some animal lives in, or the temperature and humidity (or the arrangement of things near the item of interest).
Invertebrates: An animal without a backbone. About 90 percent of animal species are invertebrates.
mammalian: A warm-blooded animal characterized by having hair or fur and by the female producing milk to feed her young and usually giving birth to live young.
protein: A compound made up of one or more long chains of amino acids. Proteins are essential components of all living organisms. They form the basis of living cells, muscles, and tissues, and also function within cells. Antibodies, hemoglobin, and enzymes are all examples of proteins. Medicines often work by attaching to proteins.
range: The complete extent or distribution of something. For example, the range of a plant or animal is the area in which it naturally occurs. (In mathematics or measurement) The range over which a value varies (such as maximum to minimum temperature). Also, the distance over which something can be reached or perceived.
reptiles: A cold-blooded vertebrate with scaled, horny skin. Snakes, turtles, lizards, and crocodiles are all reptiles.
Sun: The star at the center of Earth’s solar system. It is located about 27,000 light years from the center of the Milky Way galaxy. It is also a general term for stars like the Sun.
Source: www.snexplores.org
