What is keratin and melanin and what are their function

In which specialized organ of the plant would these cells most likely be found

Plz will mark! 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?

One gene can influence trait(s). one trait can be determined by gene(s).