Trilobites Essay

Trifles was written in the early 1900's by Susan Glaspell. This occurred far before the women's movement. Women were generally looked upon as possessions to their husbands. Their children, all wages, and belongings were property of their husbands. In Glaspell's story it is easily depicted as to what role the men and women portrayed in society at this time.

During the Cambrian Period there was an explosion of life forms. Most of these were in the water. Many animals with no backbones lived in the shallow seas. These animals were invertebrates.

These are boomerang like and have a “double button”. Liomesaspis is another type of fossil, it has a different body plan, and are “historically greater within the group than what we observe today”. A different fossil is called Mesolimulus, preserved about 150 million years ago, it looks similar to the nowadays Limulus.

Consist of the nasal passage, pharynx, esophagus, larynx, trachea, lungs, diaphragm, bronchi, and pulmonary artery and vein.

The horseshoe crab and the trilobite do share a common ancestor. There are many pieces of evidence in the anatomy of both species that support this claim. A first piece of evidence is that both species have an outer exoskeleton but no internal skeleton. This separates both of them from vertebrates, making both of them invertebrates. The second piece of evidence supporting walking legs of both species are also positioned on the underside of the animal, protected under the shell. Both the trilobite and the horseshoe crab have one horseshoe-shaped cephalothorax with a raised ridge in the middle of it and two eyes positioned on either side of the ridge. The mouth of both species is on the underside of the body as well, unlike crustaceans and insects

They are predators; mostly carnivores that feed on fish, squid, molluscs, crustaceans and marine animals; some are herbivores that feed on plankton. They can also be filter-feeders or scavengers.

Studies have found information on ancestral species of current horseshoe crabs. Xiphosurids, which are very old fossils that were not easily found; however, they were compared in body structure of current time horseshoe crabs and showed that there was hardly any change in the body structure. The body plan of a xiphosurid is described as having large crescent like shield in the anterior portion of its body resembling an invertibrate with lateral compound eyes. Xiphosurids are also classified as having opisthosomal tergites built into a thoracetron and having a long styliform telson (Rudkin et al. 2008).

octopuses, and humans. It can blend into its environment (the sand) because of the brown

Fox-Skelly, Jasmin. “Earth - Some Lifeforms May Have Been Alive since the Dinosaur Era.” BBC News, BBC, 3 June 2016, www.bbc.com/earth/story/20160602-some-lifeforms-may-have-been-alive-since-the-dinosaur-era.

According to Holmes, the Time of the Giants begins by looking at the geological and its ecological conditions which creates opportunities for the expansion of dinosaurs in the Middle and Late Jurrasic Epochs. It describes widespread changes to ocean and land enviroments, including worldwide climate changes that served as catalysts for the spread of the jurassic “giants”: the dinosaurs. The book explores the broad ranges of the largest and biggest of all land animalsand tells the discoveries and changing scientific images of the early so-called “giants” over the past one hundred fifty years. By the end of the Jurassic Period, several evolutionary trends were in motion that would be played out by the giant creatures, dinosaurs, in the next

The human body comprises of two respiratory sponges called lungs. The left lung is slightly smaller than the right as it makes room for placement of the heart. Due to this slightly smaller size, it only contains two lobes whereas the right lung has 3 lobes. Both lungs are host to the network of air sacs or alveoli which transport the air from the outside environment to the external and internal respiration processes.

When, where and how did dinosaurs live? Dinosaurs arose around 200 million years ago and lived and evolved for about 185 million years. There were 5 eras in which dinosaurs were alive; the Archezoic Era, Proterozoic Era, Palezoic Era, Mesozoic Era and the Cenozoic Era (“Dinosaurs”). Dinosaurs roamed the entire Earth when all continents were

The ocean is a dangerous place, and in the water lies some of the most mysterious creatures, three of which are the Giant squid, Zombie worm, and the Yeti crab. The history of these three remarkable animals makes them some of the ocean's strangest creatures. Although, they all live in the ocean they each face many challenges each day to find food and stay on top of the food chain. Scientist are discovering new things about these underwater creatures every day, and are digging deeper into their distinct ways of life.The Giant squid, Zombie worm, and Yeti crab all have unique appearances and completely diffrent diets.

Jurassic is a period of time with Dinosaurs, rodents and birds. There were also island seas consisting of sharks, sea monsters and blood-red planktons. The existing plants in that period were cycads, ferns and conifers. The Mesozoic era was about 245 million years ago to 65 years ago, so it almost lasted about 180 years in total. The Mesozoic era is divided into three periods of Triassic, Jurassic and Cretaceous. Mesozoic era means middle animals and it is the era, which the word’s fauna has changed from what is in the Paleozoic era and the most famous organisms of this era are dinosaurs. In the Mesozoic era, the extinction of more than 90 percent of species in the earth was observed and the reason behind it was mostly volcanic eruptions and climate changes. On the other hand, this era had massive changes that represented ecological niches and rise to new creatures such as rodent-size mammals and first dinosaurs. In Triassic, which was the first period of Mesozoic, the mammals and first dinosaurs existed. Later than that, the second period was Jurassic, which giant shaped dinosaurs and other kinds of dinosaurs were developed. Besides that the first flowering plants and primitive birds, with long teeth appeared in that era as well.

We each have two lungs, a left lung and a right lung. These are divided up into 'lobes', or big sections of tissue separated by 'fissures' or dividers. The right lung has three lobes but the left lung has only two, because the heart takes up some of the space in the left side of our chest. The lungs can also be divided up into even smaller portions, called 'bronchopulmonary segments'.