PLEASE HELP, WILL MARK BRAINLEST TO WHO EVER ANSWERS FIRST The table below shows the half-lives of four radioactive materials. Radioactive material Half-lives Bismuth-212 60.5 seconds Sodium-24 15 hours Iodine-131 8.07 days Strontium-90 29 years Which of these materials will decay the slowest to one-fourth of its original amount? Bismuth-212 Sodium-24 Iodine-131 Strontium-90

List two new traits (structural or behavioral) that each new species of rat might demonstrate as it adapts to the conditions on two of the four islands. choose only two islands that are described in the lesson. record the island latter and the major habitat feature of the island. then list two new traits each rat subspecies might demonstrate in order to survive the habitat on that island. note: new traits should be unique to that island and be in response to that island’s habitat feature. i cannot remember islands that were names in the lesson so only answer if you have done the lesson (5.13 life science 7b) choose 2 of the islands and describe a structural and a behavioral trait for a rat on each island so 4 total answers, 2 different structurals and 2 different behaviorals, one for each rat for each island

Apopulation of black bears depends on salmon from a stream for food. if a drought causes the stream to run dry one year, how will this likely impact the black bear population?

Which of the following produces carbon dioxide? a. plants b. animals c. decomposers d. all of the above