First eliminate choices C and D since they both mention that fact 1 is crossing over ( which is also referred to as genetic recombination) . So you're left with A and B and the correct answer is B .
The addition of acetyl groups to histones is associated with chromatin condensation and and higher levels of gene expression
Answer:
When cells split and increase they do this very important thing in order tonmake the new cells exactly the same as the previous before them. Each cell makes more of all it's genes. Then each one.splits into two with one group of genes in each one of the new cells. During the process they make sure that all are copied correctly.
The number of electrons in the outermost shell of an atom determines its reactivity.
Answer:
The scientific method
:
Make an observation.
Ask a question.
Form a hypothesis, or testable explanation.
Make a prediction based on the hypothesis.
Test the prediction.
Iterate: use the results to make new hypotheses or prediction
Explanation
that's the scientific method but there are many example to how you use it in everyday life i.e the lights went out and you want to find out why, perhaps you didn't pay your bill or maybe the power went out. then you would go through the steps to find out what happened
