Asymmetry In Crabs

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.

All animals with limbs have a common design. If a batwing were to be formed from a person’s hand, make the fingers extremely long; a horse elongates the middle fingers and reduce and lose the outer ones; frogs elongate the bones of the leg and fuse several of them together. All in all, despite radical changes in what limbs do and what they look like, this underlying blueprint is always present.

An invasive species is a species that is not native to an area, and whose introduction often causes harmful environmental impacts. The European Green Crab, also known as Carcinus maenas, is an invasive species from Europe. It was introduced to the U.S. most likely by ballast ship water, El Nino, or by being shipped unnoticed in the kelp packing around lobsters/bait worms. The European Green Crab now inhabits the eastern and western coasts of the US, in addition to its native home and other invaded areas.

Directions: After developing an outline to organize your reasons and evidence, construct your essay below. Don’t forget to explain how your evidence supports your reasoning, and not just explain what the quote means.

These two features earlier are examples that we can see with our naked eyes, but the DNA make up that we cannot see with our eyes alone are also laid out the same as well. In the evolutionary pathway, the genes that turn on and off for humans and fish are related through the instructions on how they function. All living things with limbs have in common the Sonic hedgehog gene (Shubin, p. 53). The Sonic hedgehog gene can control the development of the limbs in these creatures. To determine if the development of vertebrate animals can be interpreted in the same way, or have the same effect, the injection of vitamin A was used to inject into a shark, mice, and chicken embryos to see if the results were the same. The results turned out that the injection of vitamin A has indeed changed the development of limbs in these embryos. The effects cause the shark to have a mirror image of its fin, and the mice and chicken have duplication of bones in the limbs (Shubin, p.56-57). It becomes clear of what will happen if

Commonly, the red king crab is described as a generalist feeding decapod (Britayev et al. 2010). It displays a number of different feeding strategies, such as grasping and tearing apart of larger prey, scooping-up sediment by the lesser chela and sieving it through the third maxillipeds, and crushing scallops and picking out only the flesh (Jørgensen 2005). The heavy mastication of food items in crustaceans makes the identification of prey during stomach analysis difficult, and soft tissue may be underestimated in field studies (Sarda & Valladares 1990). This can introduce bias towards calcified and hard prey items, as these are more frequently identified in crab stomachs. The most frequent prey groups identified in the red king crab in Norwegian

A thick coating of mud and/or algae frequently obscures the actual color of an individual’s carapace. Present at hatching, serrated rear marginal scutes remain dentate throughout the turtle’s life.

Because of the environment an anglerfish lives in the male is always looking for a mate. Male anglerfish are always smaller than female anglerfish. They have evolved to be parasitic as they attach to the female anglerfish for nutrition. The reproduction process of anglerfish, is an interesting example of sexual dysmorphism. A male anglerfish bites into the female anglerfish with its teeth and attaches to the female. As the male’s mouth and the female’s skin weld the male loses all organs except for his testes and his vision. The male anglerfish have large noses to sense the pheromones of a female, and while they are maturing they lose their jaw teeth and their digestive systems becomes delapitated. The tissues of a male and female anglerfish fuse together when an

My pets love to eat popcorn and honey, it is their favorite treat.What animal eats popcorn and honey?. Is the question you are probably asking yourself. Why the animal that eats popcorn and honey is Hermit Crabs! Hermit Crabs make cute and wonderful pets. Hermit Crabs are very competitive just like most people and will fight over each other's shell,even if they are wearing it other hermit crabs will try to steal it.

The shell of Limulus polyphemus frequently serves as substrate for a large number of epibionts, such as barnacles, mussels, oysters, polychaetes, slipper limpets, algae and other encrusting invertebrates ( Botton, 2009; Botton et al. 2015). The term epibiosis is used to describe a non-symbiotic, facultative association between the substrate organism and sessile animals (epizoans) or epiphytic algae (Botton, 2009). Using horseshoe crabs as a substrate may be advantageous for the epibionts in that it aids in gene dispersal and feeding opportunities (Botton & Shuster, 2003). Because horseshoe crabs are migratory, any of the organisms that live on them must be able to survive the same wide range of temperatures and salinities as their hosts (Botton, 2009).

In the short story ‘’Shells’’,written by Cynthia Rylant,a boy named Michael had lost his parents and his aunt esther stepped in to take care of him.It has been 6 months and since then they have been arguing all the time.But further on in the story it shows how just a few hermit crabs can bring them closer together and this is because relationships inprove when people find things in common.

Phylogenetics is the study of the evolutionary history and relationships among individuals or groups of organisms. It can be used in both molecular and morphological data in order to classify organisms. The relationships among the brachyuran families are poorly understood due to the high morphological diversity of the group (Tsang et al., 2014). Brachyuran crabs have undergone extensive radiation and are extremely diverse both morphologically and ecologically (Spears et al., 1992).

The results from this study mirror a similar study on sand crabs in which researchers found no significant difference in sand crab abundance, sex ratio, or size between developed and undeveloped areas (Murph & Faulkes 2011). On the

Animals have different types of body symmetry. The types of symmetry are asymmetry, radial symmetry, bilateral symmetry and biradial symmetry. In bilateral symmetry, a single imaginary plane divides the body into left and right sides, which are similar. Many types of animals have bilateral symmetry and addition, possesses dorsal, ventral, anterior, and posterior segments on each of their left and right sides. Flatworms have bilateral symmetry and bilateral symmetry is more associated with increasing the mobility (De Lange, et al., 2016). Thus, we can conclude that bilateral symmetry is important in balance distribution of parts that are duplicated in the body and in the evolution of animals. For example, sponges do not have body symmetry; they are asymmetric. Presence of symmetry helps better for body plans in most multi-cellular organisms. Most of the plants and animals of same species show the same structural orientation. There are different types of symmetry like radial symmetry, bilateral symmetry, and biradial symmetry and it varies from one species to another. There are different genes which are involved in assigning proper symmetry to the animal or plant species and it is important in the evolution of animals. For example, sponges do not have body symmetry; they are asymmetric. Radial symmetry is exhibited by cnidarians and ctenophores, but tapeworms and flukes exhibit bilateral symmetry (Dzik et al., 2017).

The Scarlet letter is a novel written by Nathaniel Hawthorne in 1850 that follows main character, Hester Prynn, as she endures life in The Massachusetts Bay Colony with her daughter. Hester’s life in this society is mainly focussed around the actions of two characters other than her daughter Pearl. These characters are Roger Chillingworth and Reverend Arthur Dimmesdale. In the novel, Chillingworth was Hester’s husband when she lived in Europe and Dimmesdale is the local reverend who became the father of Pearl after a love affair with Hester. The two have contrasting roles in The Scarlet Letter but are bound together through their relationships with Hester forming the structure of the novel. With the use of symbolism, imagery, and diction, Hawthorne molds the characters of Roger Chillingworth and Reverend Arthur Dimmesdale into representations of the flawed natures of the Puritan colonies in 17th century New England.