A student lifts a backpack straight up from the ground to 1.2 m with a force of 45.5 N. How much work is done to the backpack? plz anser soon

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.

Analyze how the four requirements for life were identified by scientists

Besides regulating what enters and leaves the cell, what is another function of your choice from question #1?