During which phase of Mitosis do chromatin fibers condense into discrete chromosomes that appear as two identical sister chromatids joined at their centromeres, centrosomes move away from each other, and the mitotic spindle begins to form?

Look at the figure above. which atmospheric layer has around 80 percent of the mass of the earth's atmosphere? (hint: it's where the clouds seen on earth are formed.) a. exosphere b. troposphere c. stratosphere d. thermosphere

The oxidizing agent our bodies use to obtain energy from food is oxygen (from the air). if you breathe 15 times a minute (at rest), taking in and exhaling 0.5 l of air with each breath, what volume of air do you breathe each day? air is 21% oxygen by volume. what volume of oxygen do you breathe each day?

Suggest why placing wheels under a heavy box reduces the neccessary force required to push it along at a constant speed.