Which structure of the cell controls what goes in and comes out of the cell? cell which structure is a strong layer around plant cells? cell

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?

What’s the percent by mass of carbon in c10h14n2

Which step in naming unsaturated hydrocarbons is used for alkenes but not alkynes