Answer:
Tightly packed group of older stars large grouping of more than two stars loose, disorganized star cluster held together by gravity large collection of stars, gas, and dust held together by gravity
Explanation:
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B. Thick Atmosphere
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Keystone predators effect their habitat by keeping the population of animals down.
Answer;
-Reduce the chance of errors in correspondence
-Easier to use for converting between units while measuring
-Make communication easier between scientists comparing data
Explanation;
-The metric system is a system that is based on joining one of a series of prefixes, including kilo-, hecto-, deka-, deci-, centi-, and milli-, with a base unit of measurement, such as meter, liter, or gram.
-Since the metric system is a decimal system of weights and measures it is easy to convert between units simply by multiplying or dividing by 10, 100, 1000, etc.
-It is an alternative system of measurement used in most countries, as well as in the United States.