A scientist kept 1,000 gram samples of radioactive carbon, radium, and plutonium in three different containers. The table below shows the half-lives of the three radioactive materials. Radioactive Material Half-life (in years)
carbon 5,700
radium 1,620
plutonium 6,563

Based on the table, which of these conclusions is most likely correct?

A. After 20,000 years, approximately 250 grams of carbon and radium will be left in the containers.

B. After 6,000 years, approximately 500 grams of carbon and plutonium will be left in the containers.

C. After 6,000 years, approximately 250 grams of carbon and radium will be left in the containers.

D. After 20,000 years, approximately 500 grams of carbon and plutonium will be left in the containers.

Exit what always affects measurement error in an experiment? a. investigator bias b. variability in nature c. instrument precision d. misreading the instrument

For a to be healthy, it has to have lots of different kinds of plants and animals. all of the different types of plants and animals in an ecosystem. name four types of ecosystems from those listed in the video. b) c) d) most living things live here. all living things depend on how an ecosystem like a game of sticks? why should we build new buildings on existing land? name four extinct species from those listed in the video. b) c) d) the best way to wipe out a species is to the largest ecosystem in the world is this percent of the world is covered by water. how many of all species in the world live in the ocean? list five things you can do to increase biodiversity. b) c) d) e) how many species are we losing per hour?

What is the 77 element on the periodtic table