Information on Eukaryotic Cells
Animals are multicellular, nonbacterial eukaryotic organism in the Kingdom Animalia. With few exceptions, all animals eat organic matter, breathe oxygen, can move, can breed sexually, and regenerate tissue. Although not all animals are classified in this Kingdom, it is generally believed that all land animals are grouped into at least four families. These are Cetacea (elephants, pigs, birds), Chordidae (reindeer, deer, moose, elk), Odontophaga (elephants, guinea pigs), planktonic Organisms (fish, insects), and Protista (all vertebrates).
All animals share a common ancestry with all other mammals and some amphibians. Multituberculata include most reptiles and amphibians. All mammals have senses of smell and taste along with joints in their limbs; although animals without these abilities do exist. Metatheria includes amphibians and reptiles. A few members of this class, such as salamanders and certain hermit crabs, have joint arrangements very different from those of any other mammal.
Animals are classified into two broad categories, either placental or pouched, and each has a number of subclasses. Placental animals are born with a pouch where the infant’s ribs and sternum meet. Pouched animal are born without a pouch; they retain their ribs and sternum through development. Examples of placental animals are cats, dogs, bunnies, parrots, and chickens.
reptiles belong to a class of animals known as reptile which has a separate kingdom. Most reptiles are cold-blooded; they retain their body heat very efficiently, which explains why most reptiles are warm-blooded. In contrast, warm-blooded reptiles are warm-blooded, but their body temperatures are too low to effectively maintain body temperatures similar to that of an animal that is cold-blooded.
One branch of the Phylum Anura is that of mammals, and these animals have very specific classification. For instance, all mammals are grouped into Classes A and B. (The classification can be confusing, as there are many subclasses and classes.) Class A animals are those that have both eyes and ears. Class B animals have only one eye and no other sensory organs. Class C animals are those that have neither an eye nor an ear.
Eukaryotic animals are plants and animals that contain multiple copies of an organism’s DNA. The word eukaryotic derives from the Greek words agar (garden) and kerato (tyrant). The most common eukaryotes are bacteria, algae, protozoa, unicellular algae, metazoa, protozoa, spiroplasts, and eukaryotes that are found in various soils. Bacteria and other eukaryotic bacteria make up the majority of the eukaryotes in nature. Many types of eukaryote exist within the living world.