People often say that dogs are "man's best friend. How closely related are dogs and humans? To complete this activity, you will need a computer with Internet connection, a piece of paper, a pen or pencil, and crayons or markers. Search the Internet to find the taxonomy of the domestic dog and humans, from domain through species. Check at least three different sources to make sure the information you find is correct. Try using websites that end in .Gov or .Edu; they are usually reliable. Create a chart listing the taxonomy of each species side-by-side, similar to the chart shown below.

See explanation

Explanation:

Taxonomy actually means “arrangement law”. It is the branch of biology that deals with the classification of organisms.

The taxonomic classification system was invented by Carl Linnaeus. It is a hierarchical model of classifying living organisms based on shared characteristics.

Dogs are referred to as 'man's best friend' partly owing to some level of taxonomic relationship between the two species. Dogs and man belong to a class of vertebrates known as mammals- one of the shared characteristics of mammals is that they give birth to their young ones alive.

The taxonomic classification of man is:

Domain: Eukaryote - Kingdom - Animalia Phylum - Chordata Subphylum - Vertebrata Class - Mammalia Order - Primates Family - Hominidae Genus - Homo Species - sapiens.

The taxonomic classification of dog is:

Domain: Eukaryote - Kingdom - Animalia Phylum - Chordata Subphylum - Vertebrata Class - Mammalia Order - Carnivora Family - Canidae Genus - Canis Species - lupus familiaris

the answer is:

carbon dioxide