Which option is an element? a. oxygen

b. sodium chloride

c. air

d. water

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.

How is the shape of the poem “peer” connected to its meaning?

Describe at least two advantages and two disadvantages of using hydropower as a source of energy.