Hello someone please help, im doing a test right now and i need someone to asnwer the question below! Who ever does give the best answer gets brainliest!

In an energy pyramid, which level has the most available energy?

Which statement is true about ionic compounds?

Consider a culture medium on which only gram-positive organisms such as staphylococcus aureus colonies can grow due to an elevated nacl level. a yellow halo surrounds the growth, indicating the bacterium fermented a sugar in the medium, decreasing the ph as a result and changing the color of a ph indicator chemical. this type of medium would be referred to as a differential and enrichment culture.