Radioactive element ‘C’ decays over time to element ‘D’. Element C has a half-life span of 4 years. If you started with 16 grams of C how many grams of element C would you have after 12 years? 1) 0 grams

2) 1 gram

3) 2 grams

4) 4 grams

5) 6 grams

6) 8 grams

7) 10 grams

8) 12 grams

9) 16 grams

10) 18 grams

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human impact on the environment can be seen in the deterioration of the !

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genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).