Please help me it’s due today

Which object forms when a supergiant runs out of fuel? a red giant a black hole a white dwarf a neutron star

The diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

Which of the following represents the ester functional group? a. -coo- b. -cho c. -cooh d. c=o