We all know animals. They’re our friends, neighbors, co-workers, employees, and pets. We love them and want to care for them, so we take care of them with expensive caretakers, pet sitters, veterinarians, etc. Some of us are animal lovers who have a lot of experience caring for animals and take pride in it. Others are just beginners and are not very skilled or knowledgeable about how to take care of animals.
Animals are multi-cellular, eukaryotic, multicellular organisms in the Kingdom Animalia. With few exceptions, animals eat animal matter, breath oxygen, can multiply, move, reproduce, and die. Animals are made up of skin, muscle, nerves, organs, blood, internal body structures, and tissues. The major parts of animals are: eyes, nose, ears, fur; blood, bones, teeth, digestive system, lungs; spleen, kidney, liver; immune system, reproductive system; blood-producing and blood-absorbing organs; lymphatic system; musculoskeletal system; endocrine system; respiratory system; sensory organs; internal reproductive organs; organ systems; and reproductive organs.
The majority of animals belong to the Kingdom Animalia, which includes amphibians and fishes, but also includes reptiles, mollusks, crustaceans, insects, birds, and whales. Herbivores are animals that eat plants; most have no wings, but some have small appendages that they use to grasp plant stems. omnivores eat both plant and animal matter; some are herbivores and some are omnivores. These animals feed on a variety of foods, including meat, vegetables, roots, fruits, seeds, and even insects.
Insectivores are another class of animals, although unlike most animals, these animals have soft and hard bodies and are arboreal or terrestrial animals. Most members of this phylum are in a semi-dormant state, which means they are surrounded by a semi-solid material that prevents them from being digested when death approaches. Phylogenetically, this class of animals is grouped together because all have evolved from a common ancestor. Although some can be easily distinguished from other members of their genus or family by inspecting the shape of their external genitalia or anal sacs, the classification of Lamarckia is often more difficult. In order to classify any organism within the phylum of animals, its anatomy has to be carefully compared with other living animals and its peculiarities have to be identified, whereas in Lamarckia the comparison is very simple.
Blastula is an example of an organism that has evolved independently from all other animals. Blastula is a segmented worm, whose segmented body is held together by minute hairs called setae. The body is totally smooth and may have only one, two, or three setae on each side. These setae serve as strong hooks to capture the food of prey that the snail releases, which in turn stimulates the release of digestive juices that digest the food and produce additional setae that grow in number until the entire snail is consumed.
Blastula is noteworthy in that it has been found to be the only eukaryotic organism in the entire Biological Kingdom Eat Organic Material that is found in both aquatic and freshwater habitats. This fact alone raises the question of where these animals met the requirement for their own reproduction. To answer this, we must recognize that all eukaryotic animals share a common requirement to secrete an adequate amount of digestive juices, in order to secrete a variety of substances that help to stimulate reproduction. As such, all animals share a common ancestry and all share a common ancestry through a common ancestor, hence they all share a common ancestry with both Blastula and eukaryotes.