Evolution Of Animal Research Paper

Both of these groups have an external radial symmetry. Cnidarians have a single opening that acts as both mouth and anus and is generally surrounded by nematocyte-bearing tentacles (Steele and Technau; 2011).

Phylum: Chordata, an organism who developed a notched, a nervous system with that contain gill cleft with the vertebrates.

They must be eukaryotic, meaning they have nucleus, and in the domain Eukarya. In the Linnaean classification this could be in the kingdom Protista like a paramecium. Another Linnaean classification of this could be in kingdom Animalia, since they are heterotrophs and their cells contain a nucleus. They could be grouped as predators, since the organism is engulfing another organism. They could also be grouped based on their locomotion. They could have cilia, legs, or even flagella.

Our mouth, esophagus, stomach, pancreas, liver, gallbladder, large intestine, small intestine, rectum, and anus come together to form the digestive system which breaks down our food into simpler molecules. The food enters through the mouth, travels down the esophagus, breaks down in the stomach, pancreas, liver, and gallbladder and then moves through the intestines down to the rectum and anus. A pig’s digestive system is no different than a human’s. A foregut, midgut, hindgut, and a digestive gland form the digestive system of a crayfish. The foregut contains the stomach (partially breaks the food down), the

When society thinks about starfish, perch, chordate, and fetal pig they become extremely curious about how their bodies operate because of how they are made up. I will give a brief synopsis of all animals before going into major detail about them. According to the online website named dictionary.com, Starfish are any echinoderm of the class Asteroidea, having the body radially arranged, usually in the form of a star, with five or more rays or arms radiating from a central disk; asteroid (dictionary.com). It is known that a chordate is an animal belonging to the phylum Chordata, composed of true vertebrates and animals having a notochord (dictionary.com). According to research, a fetal pig is an animal in the phylum Chordata and class Mammalia (dictionary.com). A perch is known to be a certain kind of fish with very spiny fins (dictionary). Starfish, perch, chordate, and fetal pig are some very interesting animals that possess some exclusive qualities both similar and different.

The book Your Inner Fish by Neil Shubin is a journey into 3.5-billion-year history of the human body. The book is an entertaining and useful novel that demonstrates the evolution of some of our major structures through time. By analyzing fossils and DNA, the author shows us that our hands truly resemble fish fins, our head is organized like that of a long-extinct jawless fish, and that major parts of our genome look and function like those of worms and bacteria. The book takes us on a remarkable expedition in which it will show us our inner fish, reptile and

Sean Carroll’s book Endless Forms Most Beautiful, attempts to explain the variety of animal forms, structures and functions by comparing them to rules that he had found. Such rules include: major “rules” for generating animal forms, species-specific encoding information, evolutionary diversity and large-scale trends in evolution. It begins by assessing the similarities between ancient and modern organisms. It notes that the structure of certain parts like vertebrates and limbs are similar in proportion and can be varied in shape and repetition. It cites animals parts like butterfly wings to show repetition of scales, snakes to show repeating vertebrae and compared a salamander to a dinosaur to express how each follow the same modular body plan.

The fossil of Tiktaalik confirmed a major prediction of paleontology in that it showed characteristics of both aquatic animals, such as fish, and land animals, such as reptiles and amphibians. While it had fins and scales, it also had a flexible neck, a flat head, and complex bone structure in its fins that correspond with the structure of the legs of terrestrial animals. Thus, it demonstrates the evolutionary transition between aquatic and terrestrial life.

Animal science is a very broad topic. Form General Animal Science class I have learned that animal science is concerned with the science and also with the business to produce livestock such as cattle, horses, sheep, swine and poultry. In this course I have also learned that the scientists apply various genetic modifications on animal to increase production and management of livestock. To supply for the demand of animal in worldwide the industries of livestock are responsible for maintaining the well-being of the animals. The three concepts that I learned after taking this class are choosing the right breed of animal is necessary for mass production, genetic selection, and food safety.

They are dioecious animals that use external fertilization for reproduction, while Pterobranchia uses mostly asexual reproduction by budding. Their feeding patterns vary from each class, and feeding appendages help them obtain the food they need. They have sense organs such as photoreceptors and a single preoral ciliary organ which is in front of the mouth located at the ventral side of the proboscis of the animal (Dobbs. 1988). The proboscis is important for them because that is where all of the neurosensory cells reside (Barrington. 1965). Therefore, this phylum consists of about 120 species that are mostly known and some not except the main two classes introduced. New species of the phylum hemichordata are yet to

New discoveries have been found that prove the Giraffe family went through two stages of evolution, which involved cervical elongation. New studies done on Giraffe fossils reveals the likely hood of evolution in stages, “first toward the head, then later towards the tail a few million years later,” (Solounias, 2015). There were different species of Giraffe’s that underwent only one stage of the evolution process, and ended up becoming extinct. The modern Giraffe is the only species that have undergone the whole process of evolution. There are other Giraffes who have shorter necks mainly found in Africa, but they attribute their evolution of those species who only underwent one stage of the evolution process. They plan to study the Giraffes

I’ll be starting with their bill. It greatly resembles a duck bill, but it is significantly different. Duck bills are hard and used to catch fish, so it has to be strong enough to hold a fish. However, with platypi, their bill is a lot longer and is only meant to catch worms, shrimp, and other small creatures. Therefore, the platypus bill, unlike a duck bill, is rubbery and

They are cold blooded tetrapods having ability to live both in water and on land. *Two pairs ofpentadactyle limbs. However,some forms are limbless. *Skin is moist,glandular and devoidof scales (except gymnophiona). *Nostrils are paired. *Eyes with movable eyelids. *Skeleton is mostly bony.

All are carniverous and have four pair of walking legs, one pair of pedipalps, and one pair of chelicerae. (Spiders, W.Shear) Each chelicerae consists of a base and a fang.

Metazoans are most likely a clade, that is, they all descended from one kind of protist. All metazoans originally had one cilium or flagellum per cell, for example. Metazoans also share the same kind of early development. They form into infolded balls of internal cells which are often free to move, and are covered by outer sheets of cells that form an external coating for the animal: a skin, if you like.