How does algal growth caused by agricultural waste kill marine organisms? a. by blocking sunlight and depleting oxygen. b. by increasing oxygen levels in the water. c. by maintaining balance in the water d. by decreasing the carbon dioxide intake of organisms

The comparison of the number of atoms in a copper coin the size of a penny with the number of people on earth is made to illustrate which of the following? a. that atoms are indivisible b. that atoms are very small c. that atoms are very large d. that in a copper penny, there is one atom for every person on earth