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

Which of the following occurs after a natural or unnatural disturbance in an ecosystem

3points hurry! what is the relationship between biotechnology, sharkskin, and disease resistance? bioengineers have developed an artificial sharkskin that does not allow resistant bacteria to grow on it. disease-causing microbes have been genetically modified to keep them from infecting the skins of sharks. scientists have created a device that can be attached to the skins of sharks that dramatically increases their abilities to resist disease. sharkskin produces many chemicals that can be collected and used to create antibiotics.

How does deforestation affect the water cycle? a. it increases the amount of runoff b.it increases the amount of percolation c. it increases the amount of transpiration d. it increases the amount of precipitationa it increases the amount of runoff