Which situation is a result of human activities a. decay of leaves in a forest adds to soil fertility b. acid rain in an area kills fish in a lake c. ecological succession following volcanic activity reestablishes an ecosystem. d. natural selection on an island changes gene frequencies

Achange in the number of neutrons in an atom will change an blank . when the number of protons changes in an atom, a new element will form.

Using a value of ksp = 1.8 x 10-2 for the reaction pbcl2 pb+2(aq) + 2cl -(aq). if the value of ksp was determined to be only 1.2 x 10-2: too much solid has dissolved. additional precipitate is forming. the solution is unsaturated. the ions are now combining to reduce their concentrations.

Select all that apply. a beta particle: is electromagnetic energy is an electron has zero charge is emitted from the nucleus has a +2 charge has a -1 charge