In the examples below, notice that transportation and park ticket prices stay the same even when the number of days changes. If you're staying somewhere that's relatively inexpensive and not eating out all the time, you can often extend a trip from 4 to 7 days for very little money.
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Pit eyes, also known as stemma, are eye-spots which may be set into a pit to reduce the angles of light that enters and affects the eyespot, to allow the organism to deduce the angle of incoming light. Found in about 85% of phyla, these basic forms were probably the precursors to more advanced types of simple eye. compound eye may consist of thousands of individual photoreceptor units or ommatidia (ommatidium, singular). The image perceived is a combination of inputs from the numerous ommatidia (individual eye units), which are located on a convex surface, thus pointing in slightly different directions.