During which season is productivity the greatest in temperate waters?

Which of the following is not am example of a polymer? protein nylon kevlar concreta

Select all of the following that are equal to an impulse of 20 unitsa) force= 5, time= 5.5b) force= 25, time= 0.8c) force= 0.1, time= 200d) force= 10, time= 2(its b, c, and d)(also in order to find answer they have to add to get the unit)ex= 25x.8=20 or .1x200=20

Smallest intensity of a stimulus that you can detect 50 percent of the time is