SI is a base 10 standardized system. I hope this helped and if not I highly recremend talking to your teacher or a parent.
Group of people could have a very specific challenge having to do with the person or the task - need to watch the same person to see how they change; Ex: some type of physical or cognitive challenge and want to see their progression
Hope this helps
The structure is named as Centromere to which the Two chromatids of the mitochondria are connected.
There are 46 chromosomes in one genome. And 1 genome has approxiamtely 3 billion base pairs. And this base pair is 0.00000000034 meters long.
:)
I believe it is natural selection. Natural selection is when over a period of time, traits that are formed to help the organism survive, are passed to the next generation. For example, if there were two types of rabbits. One had black fur and the other was white. They both lived in the artic. The black furred rabbits are mostly eaten by predators because their black fur is easily seen against the ice and snow. Over a period of time, the black furred rabbit would die out. The next generation would mostly have white fur to help them survive.