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Sand Dollar Facts

A sand dollar ( Echinarachnius parma ) is an echinoid, a type of invertebrate animal whose skeletons-called tests-are commonly found on beaches the world over. The test is usually white or grayish-white, with a star-shaped marking in its center. The common name for these animals comes from their likeness to silver dollars.
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A Brief History of the Clarinet

Most musical instruments evolve into their present form so gradually over many centuries that it is hard to pinpoint a date they were invented. This is not the case with the clarinet, a tube-shaped single-reed instrument with a bell-shaped end. Although the clarinet has seen a series of improvements over the last few hundred years, its invention in around 1690 by Johann Christoph Denner, of Nuremburg, Germany, produced an instrument very similar to the one we know today.
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What Is a Least Squares Line?

A scatterplot is a type of graph that is used to represent paired data. The explanatory variable is plotted along the horizontal axis and the response variable is graphed along the vertical axis. One reason for using this type of graph is to look for relationships between the variables.​​ The most basic pattern to look for in a set of paired data is that of a straight line.
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Indian Red Scorpion Facts

The Indian red scorpion ( Hottentotta tamulus ) or eastern Indian scorpion is considered to be the most lethal scorpion in the world. Despite its common name, the scorpion isn't necessarily red. It can range in color from reddish brown to orange or brown. The Indian red scorpion doesn't hunt people, but it will sting to defend itself.
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35 Common Prefixes in English

If you were a prefix, you could change the same word in different ways.You could make a cycle a uni cycle, a bi cycle, or a tri cycle. (Marcie Aboff and Sara Gray, "If You Were a Prefix." Picture Window Books, 2008) A prefix is a letter or a group of letters attached to the beginning of a word (or word root) that partly indicates its meaning.
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Practice in Identifying Compound Subjects

A compound subject contains two or more simple subjects that are joined by a conjunction and that share the same predicate. In this exercise, you will practice identifying compound subjects. Practice Sentences Only some of the sentences below contain compound subjects. If the sentence does contain a compound subject, identify each of the parts.
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