Unit 38 P2

Mutualism is when two organisms have a relationship in which both of them benefit.An example of mutualism is algae and the spider crab.Since spider crabs spend most of their time in shallow water they can be seen by predators.Algae will make the spider crabs back their home.Now with the algae on their back, the spider crab is able to disguise itself from predators.If the spider crab did not have the algae it would be eaten by predators,if the algae didn't have the spider crab it would not have a home.

Commensalism is when one species can benefit from a relationship and not hurt the other. There are four different main types; chemical, inquilinism, metabiosis and phoresy. Chemical commensalism is most often observed between bacteria. It involves the species of one bacteria feeding on the chemicals produced or the waste products of the other bacteria. Inquilinism involves one species using the body of another organism as a platform or living space while the host does not benefit or is harmed. Metabiosis occurs when one species unintentionally creates a home for another species through one of its normal life activities. A phoresy takes place when one organism attaches to another organism specifically for the purpose of gaining transportation. An example of commensalism (inquilinism) is barnacles and whales. Barnacles are non-moving and they rely on currents to bring them food. Some barnacles attach themselves to whales in order to help them live. They can benefit as they are then transported over the ocean which exposes them to more feeding oppurtunities. The whale neither benefits or is harmed by the barnacles.

There are three forms of symbiotic relationships namely mutualism, commensalism and parasitism. The partners in a symbiotic relationship may either benefit from, be unaffected by, or be harmed by the kind of relationship that exists between them, (Berg 2007). Mutualism is a symbiotic relationship in which both the partners benefit from the relationship, (Berg 2007). Commensalism is a symbiotic relationship whereby one party benefits while the other party is neither harmed nor benefits, (Berg 2007). Parasitism is a symbiotic relationship in which one party benefits while the other is harmed, (Berg 2007).

In all symbiotic relationships, one of the species involved in benefited. In Mutualism, both are benefited, in Parasitism one is harmed by the other’s gain, is commensalism one is not affected by the other’s gain. In a Cooperative relationship, both are working together to achieve a common goal. In Predation, one organism is preyed upon by another, who will most likely use the organism for food.

A virus is a small capsule that contains DNA or RNA, viruses, unlike bacteria are not self sufficient and need a host in

What is an omnivore? An omnivore is a creature that consumes both plants and animals for nutrition. In Michael Pollan’s The Omnivore’s Dilemma he explains just as the title suggests, the omnivore’s dilemma. In it he describes how omnivores, such as ourselves, came to eat the way we do now. Pollan divides his writing into four main areas: introducing what the omnivore’s dilemma is, explaining how we decide what to eat, introducing our anxieties towards eating, and the problem with how Americans decide what to eat. Pollan also calls on the expertise of Paul Rozin, who performed experiments with another omnivore, rats, and others.

poisonous creatures, deadly to those who are unsuspecting, of those whom are not from the area.

The position is called a trophic level. For example, fox eats birds, so if the food chain contained a fox and a bird then the fox would be at a higher trophic level then the bird.

What is an omnivore? An omnivore is a creature that consumes both plants and animals for nutrition. In Michael Pollan’s The Omnivore’s Dilemma he explains just as the title suggests, the omnivore’s dilemma. In it he describes how omnivores, such as ourselves, came to eat the way we do now. After he discusses the basics of that, he proceeds to talk about Americans and how they eat. Pollan divides his writing into four main areas: introducing what the omnivore’s dilemma is, explaining how we decide what to eat, introducing our anxieties towards eating, and the problem with how Americans decide what to eat. Pollan calls on the expertise of Paul Rozin and other specialists to help back up his claims.

Earth’s vegetation and animal life are all part of an intricate “web” of essential relations in which both cannot survive without the other. According to Campbell’s Biology textbook, The transfer of food energy up the trophic levels is referred to as a food chain. This chain usually begins with plants, (primary producers), then herbivores, (primary consumers), to carnivores (secondary, tertiary and quaternary consumers), and finally decomposers. When one part of the chain is low in population, the species above it are likely to be negatively affected and will likely drop in population as well. In order to show how delicate this web is, and how human activity has affected this system, Carson describes a small food chain in which sagebrush

If a predator organism was removed from an ecosystem, it would allow the prey population to increase which could lead to not having enough food for these organisms to eat. For example, if wolves were eliminated from the taiga biome than there would be a dramatic increase in the population of moose. This would result in the moose not having enough jack pine and could lead to starvation. The wolves would then have to eat more rabbits, elk, and voles which would decrease their population and starve the organisms that rely on these animals.

Viruses are microscopic organisms that can only replicate inside cells of the host organism. Viruses for the most part are so small you would have to use a conventional optical microscope. Viruses can infect any and all types of organisms, such as animals (to include Humans), plants and even bacteria as well as archaea (archaea constitutes a domain or kingdom of single-celled microorganisms). There are millions of different types of viruses. With viruses being believed to be the most abundant type of biological entity, they can be virtually found in every ecosystem on the planet.

One of the most complex and unexplored disease causing agents are viruses. They are known to be able to infect a wide array of organisms, from plants and animals, to bacteria and fungi. Essentially, anything that is living is capable of being infected with a virus. Once the host's cell is infected, the viruses' goal is to produce more viruses which will infect neighboring cells to continue the cycle.

After looking at many articles I believe that viruses are not alive. Even though in the beginning I believed they were. For an object to be alive it needs to have certain characteristics such as being able to: grow, develop, have a purpose, reproduce, adapt, and have cells. A living thing could reproduce which means they would make offspring. Viruses don't have the ability to grow and develop on their own. Viruses don’t have the ability to reproduce on their own without the help of a keeper

A symbiotic relationship is a relationship that is mutually beneficial to each person. A person can be extremely affected and value a symbiotic relationship. In the novel Of Mice and Men by John Steinbeck, Lennie and George display a skewed symbiotic relationship. The relationship between the two men is more beneficial for Lennie than George.