True or false a cell makes a copy of its dna during the stage of the cell cycle call mitosis if false what is the word or statement to make it true

Aboy with an extra x chromosome probably has which of the following syndromes?

When ash and dust begin to settle on the ground, they eventually become compacted by

Which line in the graph above best illustrates an effect of the carbon dioxide level in the blood on breathing rate before, during and after a period of exercise? 1.b,2.c,3.a,4.d