Differences Between Whales, Dolpins and Porpoises

Are dolphins and porpoises whales? These marine mammals have many things in common. Whales, dolphins, and porpoises all fall under the order cetacea. Within this order, there are two suborders, the Mysticeti, or baleen whales, and the odontoceti, or toothed whales, which includes dolphins and porpoises as well as sperm whales.  If you consider that, dolphins  and porpoises are really whales.   Size Matters for Being Called a Whale or Not While dolphins and porpoises are in the same order and suborder as whales, they generally arent given a name that includes the word whale. The term whale is used as a way to distinguish size among species, with cetaceans longer than about nine feet considered whales, and those less than nine feet long considered to be dolphins and porpoises. Within the dolphins and porpoises, there is a wide range in size, from the orca (killer whale), which can reach lengths up to about 32 feet, to the Hector’s dolphin, which can be less than four feet long. Thats how the orca comes to have the common name of killer whale. This distinction keeps alive our image of a whale being something very large. When we hear the word whale, we think of Moby Dick or the whale that swallowed Jonah in the Bible story. We dont think of Flipper, the bottlenose dolphin of the 1960s television series. But Flipper could rightly claim he was, in fact, classified with the whales. Difference Between Dolphins and Porpoises While dolphins and porpoises are very similar and people often use the term interchangeably, scientists generally agree that there are four major differences between dolphins and porpoises: Dolphins have cone-shaped teeth while porpoises have flat or spade-shaped teeth.Dolphins usually have a pronounced â€Å"beak,† while porpoises do not have a beak.Dolphins generally have a very curved or hooked dorsal fin, while porpoises have a triangular dorsal fin.Porpoises are generally smaller than dolphins. Meet the Porpoises To get even more specific, the term porpoise should also refer only to the seven species that are in the family Phocoenidae (harbor porpoise, vaquita, spectacled porpoise, Burmeister’s porpoise, Indo-Pacific finless porpoise, narrow-ridged finless porpoise and Dall’s porpoise). Similarities Between All Whales - the Cetaceans All of the cetaceans have a streamlined body and adaptations for living in the water and never coming onto land.  But whales are mammals, not fish. They are related to land mammals, such as the hippopotamus. They are descended from land animals that looked like a short-legged wolf. All cetaceans  breathe air into their lungs rather than getting oxygen from water via gills.That means they can drown if they cant surface to bring in air. They give birth to live young and nurse them. They also are able to regulate their body temperature and are warm-blooded. Sources: American Cetacean Society. 2004. ACS Cetacean Curriculum (Online), American Cetacean Society.Waller, Geoffrey, ed. SeaLife: A Complete Guide to the Marine Environment. Smithsonian Institution Press. Washington, D.C. 1996.

Obama Calls Preliminary Deal with Iran Our Best Bet Essay

Essays on Obama Calls Preliminary Deal with Iran Our Best Bet Essay The paper "Obama Calls Preliminary Deal with Iran Our Best Bet" is a great example of an essay on politics. In the recent past, there have been calls and moves by the global community to curb the upsurge of the assembling of nuclear weapons by Iran. The world or the United Nations has in the past threatened Iran and indeed effected bans and sanctions against Iran on the purported nuclear weapons and armory collection. However, the surge of other countries and neighboring nations such as Israel have increased their participation and interest in the issue of nuclear expansion in Iran. Obama has since called the renewed surge by the global partners, the best shot and chance of curbing or dealing with the menace of Iran. In principle, Israel has also warned that it would invoke or initiate military actions on top of monitoring measures to curb the threat or surge of nuclear weapons by Iran.   Question: the qualitative possibility of improvement on the success of monitoring Iran nuclear plans by USA and Israel:Obama has since termed the move to join the current move and aim by Israel as the best move in ensuring that the endeavor by Iran to assemble nuclear weapons is defeated. This is so because the U.S cannot afford another military incursion into Iran on such claims and secondly, the sanction by the United Nations Security Council does not yield fruits (Shultz et al 6). In principle, the United States would be better placed to rally behind Israel who is perennial rivals with Iran and instead offer their support to ensure the nuclear plants are monitored. Similarly, it is in the best interest of the United States and the global community to have eyes in the procurement process used by Iran in the nuclear plant. The graph below shows the qualitative likelihood of success of the joint supervision and mission in Iran nuclear supervision.

Richard Frethorne free essay sample

Richard Frethorne, an indentured servant, a young man forced to grow up in a challenging area known as Colonial Virginia. Becoming an indentured servant, one must sign a contract giving them a working environment hoping for some land in return once the contract has expired. Depending on age, one would typically work for around five years. Richard Frethorne wrote this letter to his parents back home describing his struggles, his thoughts and opinions, and work environment. Richard Frethorne was forced to work throughout the day’s and night’s with little to no water and perhaps a mouthful of bread to end his day. Death by starvation was just over the horizon, and for many, it killed them. Exhaustion, disease and even constant attacks from the natives killed many of the workers. Colonial Virginia is a newly formed colony, with majority of workers fighting their way to survive in their unpleasant work environment, trust was out the window. We will write a custom essay sample on Richard Frethorne or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page Many would steal food and clothing from others, mainly from people who have became sick and weak with distress. Coming from England, Richard had no idea on how much of a struggle he would have to go through in order just to survive the working conditions. In his letter Richard stated, â€Å"†¦that I have eaten more in a day at home than I have allowed me here for a weeke. † This quote had me thinking how hard it really must have been for Richard to even survive a month, I couldn’t’ even do that, but luckily he came across a couple who lends a helping hand. A sense of family is found in the new world due to this couple, though they too are struggling. The tone and desperation of this letter became clear once I read â€Å"But this is Certaine I never felt the want of ffather an mother till now,†¦Ã¢â‚¬  He is a child crying for his parents, wanting to go back home , â€Å"†¦I beg of you to helpe me. † These two quotes basically sums up the whole letter, his whole tone of the letter, and the way he feels about being an indentured servant. His cry for help to his parents were short heard due to the fact that the Atlantic Ocean separated them. His parents had no role in his life in Virginia but a memory to go back to, to feel at ease. Life in Colonial Virginal as an indentured servant sure had its downs. Seen through the eyes and mind of Richard Frethorne as one, we now can say we’ve seen it through thousands of indentured servants fighting their way for a better life. The dishonest truth these people were put through gave them little to no hope for the remainder of their short lived lives. Being faced with this hardship I could only imagine how many more of these servants were crying for help. Richard Frethorne, a fighter amongst many.