How Starfish See With Eyespots

How Starfish See With Eyespots Starfish, which are more scientifically known as sea stars,  dont have any visible body parts that look like eyes. So how do they see? While it may not look like starfish have eyes, they do, although theyre not like our eyes. A starfish has eyespots that cannot see much in the way of details but can detect light and dark. These eyespots are at the tip of each of the starfishs arms. That means that a 5-armed starfish has five eyespots, and a 40-armed starfish has 40! How to See a Starfishs Eyespots A starfishs eyespots lie underneath its skin, but you can see them. If you get a chance to gently hold a starfish, often it will tilt the end of its arms upward. Look at the very tip, and you might see a black  or red dot. Thats the eyespot. Cartoons that portray starfish with a face with eyes in the center of their body are therefore inaccurate. A starfish is actually looking at you with its arms, not from the center of its body. Its just easier for cartoonists to portray them that way. Structure of the Sea Star Eye The eye of a sea star is very small. On a blue star, they are only about half a millimeter wide. They have a groove on the underside of each arm that has the tube feet that stars use to move. The eye is made of a couple hundred light-collecting units and is located at the end of one of the tube feet on each arm. It is a compound eye like that of an insect, but it doesnt have a lens to focus the light. This reduces its ability to see anything but light, dark, and large structures such as the coral reef it needs to live on. What Sea Stars Can See Sea stars cant detect color. They dont have the color-detecting cones that human eyes do, so they are colorblind and see only light and dark. They also cant see fast-moving objects as their eyes work slowly. If something swims by them fast, they simply wont detect it. They cant see any details because they have so few light-detecting cells. Experiments have shown they can detect large structures, and even that was a surprise for scientists, who for a long time thought they could only see light and dark. Each eye of the sea star has a large field of vision. If all of their eyes werent blocked, they could see for 360 degrees around themselves. They could probably limit their field of vision using their other tube feet on each arm as blinders. Sea stars likely see just enough to be able to get to where they want to be, on a rock or coral reef where they can feed.

Micro Assignment Essay

Micro Assignment Essay Micro Assignment Essay Question 1 A) POINT ONE P1=$2.26 Q1=620.82 The price elasticity of demand using the midpoint method can be calculated with the following equation: = (Q2-Q1)/ ((Q2+Q1)/2) (P2-P1)/ ((P2+P1)/2) Using the values given, the equation is as follows: = (580270-620820)/ ((580270+620820)/2) ($3.39-$2.26)/ (($3.39+$2.26)/2) = 0.06752200084923 40 This shows that the price elasticity of demand for Metlink train tickets is: = 0.16880500212308 B) From the figures provided, we can see that as the price of the train ticket rises, the quantity demanded falls. This follows the law of demand meaning that train tickets are a normal good, as opposed to a giffen good that goes against the law of demand. Due to the elastic figure being less than 1 we can draw the conclusion that train tickets are inelastic. This means there is a relatively small change in the quantity demand despite a change n price. This also suggests that Metlink train tickets are a necessity opposed to a luxury. Question 2 Although previous national studies showed video rentals as being inelastic new evidence from a video store contradicts these results. The manager at the store increased their price expecting a rise in their profit, but in fact the increased price had the opposite effect. This is because although the video rental demand had previously been shown to be inelastic time had past. In the time that had past the ability of the renters to substitute renting video had changed. With new technology it is now easy to download movies thus creating less demand for renting them. Due to new revolutions the demand curve would now become elastic so the demand curve has flattened out. This means because the price has been raised by 20% the demand for video rentals will reduce proving it harder to rent out videos. Revenue will decrease due to lower sales and although being at a higher price it does not match previous years income. This is represented in the following graph: Question 3 A) i) In the short term, if scientists discovered that eating soybeans prevents cancer and heart disease this would shift the demand curve to the right. As a result the quantity demand rises due to consumers hearing that soybeans are good for your health. This increases the equilibrium price and quantity, because there is no shift in the supply curve so the equilibrium point moves to the right with the demand curve. This is represented in the following graph: In the long run if scientists discovered that soybeans prevents cancer and heart disease this would shift the demand curve to the right. As a result the suppliers would be more willing to increase supplies because of the money they will receive for the more goods they produce. This shifts the supply curve to the right. The increase in supply decreases the equilibrium price but increases the demand. This is represented in the following graph: ii) With the increase in the supply in soybeans the space for the feed corn to grow is reduced. Thus there would a shift in the supply curve to the left. This would mean a shift in the equilibrium price would rise. Thus feed corn would be selling for a higher price but the demand would be less. This is represented in the following graph: B) i) The effect that nylon being invented would have on the domestic cotton industry is that the demand for cotton will decrease, shifting the demand curve to the left. Due to nylon being a substation for cotton. Thus the equilibrium price and supply will decrease. Meaning the sale of cotton will reduce which will in turn force suppliers to decrease the price of cotton. This is represented in the following graph: ii) The effect the cotton gin being invented would have on the domestic cotton industry is that the supply curve would shift to the right due

Community Supported Agriculture Research Proposal

Community Supported Agriculture - Research Proposal Example re created by individuals, and especially farmers in European parts of the globe to bear the expenses of farming, in order to acquire most out of the land. (Duram, pp. 77) In terms of definition, farming is performed and food is distributed according to a new socio-economic model, referred as community-supported agriculture. Moreover, community and its members play a vital and significant role in the development and maintenance of community-supported agriculture, which results in mutual benefits for the community from food production. Some of the tasks involved in CSA are delivery of produced foods on a weekly basis, which is performed by different community members. Nowadays, community-based agriculture is mostly used in the United States; however, a number of similar approaches of agriculture can be seen in other parts of the globe as well. In order to understand this form of agriculture in a detailed manner, it is essential to explore the different characteristics of it. Specifically, production of high-quality fruits and vegetables is the notion and mission of community-supported agriculture, which is achieved by the support of community members. A stronger consumer relationship can be observed in such form due to greater involvement of consumers with the producers. Every season, a supportive group of community decides to fund the budget of production, and thus, all the tasks and jobs are performed by the individuals in a collective manner. According to theories related to community-supported agriculture, a higher quality during the production of foods can be achieved by collective support and management of farming, and that is the core of such form of agriculture. In community-based agriculture, farmers do not have bear the expenses alone, which often results in reduction of quality standards, in order to lower the costs. However, the whole budget of a season is supported by the community members, and weekly production is distribution among these members,