The outermost layer of plant stems in discotyledons consists of epidermal cells and guard cells that surround opening called stomata. The epidermal cells are usually covered whit a waterproof layer that provides protection from injury and water loss. The stomata allow gas exchange. The epidermal cells and stomata have function similar to those of which two human body system

About __ of the mass of the cell is water

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.

Wich is not standing in the way of astronomers getting a good view of different star