This gas is formed when nitrogen oxides react with a group of air pollutants known as reactive organic substances in the presence of sunlight. it's presence in the stratosphere is protective but can be toxic in the troposphere. carbon dioxide nitrogen ozone hydrogen

Analogy- 1 is to arete as 5 is to cirque horn glacial valley hanging valley

Ricardo notices that when he plays soccer in the rain, his ball does not seem to go as far after a kick. what is the best scientific question that ricardo could ask about this observation? is soccer better played in the rain or sun? how does rain affect the distance a soccer ball can travel? how does rain affect the speed of a soccer ball? is soccer affected by the rain?

Can a trait be both polygenic and have multiple alleles? explain why or why not.