What does selection mean in scratch?

How many grams of hydrogen are there in 200g of NaC2H3O2? Why are kids being taught that global warming is a fact in school when it is an unproven theory at best? How much is 3 inches in cm? Where do ribbon eels live? When a star runs out of hydrogen what does it use as a fuel source? Where do the nerves go from a ganglion? How can radioactive dating show the absolute rock age? Why does the source and sink for translocation in a plant change at different stages in the growth of a plant? why does diffusion occur faster in hot warer than cold? How did galieo and observation of Jupiter and moon help to show that the geocentric explanation is incorrect? Where in the Atlantic ocean do hurricanes start to develop? What Statements is true In the lytic cycle the virus hides in the host and DNA. Stress can cause a virus to switch from the lysogenic cycle to the lytic cycle. Stress can cause a virus to switch fr? What products does Paperchase produce? How is global warming affecting the arctic wildlife? Explain why hotter volumes of the same gas are less dense than cooler ones? How often should you get a pelvic exam? What is pharmaceutical chemistry? What are vital stains? Can you use both 15 amp and 20 outlets on the same circuit? What planet is rocky and has an atmosphere made up on mainly nitrogen and oxygen it has on natural moon?