The graph below shows the radioactive decay of potassium whose half life is 1.25 billion years.

graph with amount of radioactive potassium present (in grams) plotted on y axis and number of half-lives plotted on x axis. the points (0, 1000), (1, 500), (2, 250), (3, 125), and (4, 62.5) have been joined using a smooth curve.

in your own words, summarize the information provided by the graph about the radioactive decay of potassium.

there is none because earth is stationary and flat.

the population of unionid mussels in the hudson river decreased after zebra mussels were introduced. zebra mussels, a nonnative species, competed with the unionid mussels for food. the zebra mussels were able to outcompete the unionid mussels, allowing the zebra mussel population to increase dramatically over six years. the unionid mussel population decreased due to a lack of food.

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