The cell wall is tough flexible and fairly rigid layer that surrounds some types of cells. it is located outside the cell membrane and provide cells which structural support and protection all but one type of organisms have cells with cell walls what is the cell wall is tough flexible and fairly rigid layer that surrounds some types of cells. it is located outside the cell membrane and provide cells with structural support and protection all but one type of organism have cells with cell walls. what is it?

When does a spring tide occur? question 9 options: they occur when the sun, moon, and earth are aligned. in spite of their name, these tides occur twice a year in the spring and fall. they occur on the date of the vernal equinox each year, no matter what stage the moon is in. this is why they are called spring tides. they occur when the sun, moon, and earth are at 45-degree angles from each other. this happens once every spring. they occur when the sun, moon, and earth are aligned. in spite of their name, these tides occur all year long.