The crusades start a chain of events that led to European discovery of the new world, they blocked trade routes between Europe and Asia and prevented skills and spices from reaching Europe.
European sailors began to use the Arabic compass and astrolabe to search out better sea routes for his or her journeys. Eventually this led to the discovery of the New World.
This heightened level of trade led to the expansion of cities and towns. Among the cities especially affected were the Italian city- states.
Crusading in northern and eastern Europe led to the expansion of kingdoms like Denmark and Sweden, similarly because creation of new political units, as an example in Prussia.
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Cones are concentrated at the center of retina called fovea centralis where no rod cells are present.
The retina is the innermost lining of the eye, made up of thousands of light-sensitive cells, with an inner part of nerve tissue and a pigmented outer part. It plays a fundamental role in the formation of images, which will be projected and then sent to the brain, through electrical impulses.
The retina consists of three types of layers: bipolar neurons, ganglion neurons and photosensitive cells.
Bipolar neurons promote the union of photosensitive cells with ganglion neurons, which are grouped with nerve fibers and thus originate the optic nerve. It carries nerve impulses to the brain. Photosensitive cells, due to their shape, are named in two types: cones and rods.
There are about 6 million cones that are concentrated in a small depression located in the macula lutea (center of the retina) called the fovea. They have an elongated and cylindrical shape, with conical outer segments. It is in this region that the image is most clearly formed, as they are stimulated by the most intense light. Cones are specialized in the accuracy of daytime vision and in recognizing color. There are three types of cones that have fundamental photopigments that respond to light of wavelengths (λ): cyanopigment - S cones (short λ) - sensitive to blue color, chloropigment - M cones (medium λ) - sensitive to green color and erytopigment - cones L (λ long) - sensitive to red color. The brain interprets the signals received by these cones, which allows it to process color differentiation.
Answer:
Dickens uses vivid language, elements of classic ghost stories and a clear five-part structure to present this Christmas story.
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<span>B: Canadian Shield is where much of Canada's wealth is found.</span>
Answer:
Effective housekeeping can help control or eliminate workplace hazards. Poor housekeeping practices frequently contribute to incidents. If the sight of paper, debris, clutter and spills is accepted as normal, then other more serious hazards may be taken for granted
