30 POINTS!! Scientists must use microscopes to study the cells of living things. Explain why microscopes are necessary to study cells. Then, describe some things microscopes have helped scientists discover about cells

If a set of instructions that determines all of the charactersitics of an organism is comparedto a book, and a chromosme is compared to chaper in the book, then what might be compared to a paragraph in the book?

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.

In a hardy-weinberg population with two alleles, a and a, that are in equilibrium, the frequency of allele a is 0.1. what is the frequency of individuals with aa genotype? a) 0.42b) 0.20c) 0.32d) 0.81