Can someone please help me with these? And provide explanations because I’m lost :(

Which of the following did jj thompson discover about atoms? a)an atom has an internal structure. b) atoms are tiny indivisible particles. c)electrons orbit the nucleus of an atom. d) the nucleus of an atom contains protons and neutrons.

What is the name of the enzyme that forms at the start of transcription?

Who examines and coordinates the cleanup of polluted sites?