What is an exmaple of a chemical reaction?

hydrogen + oxygen ---> water.

iron + oxygen ---> rust.

potassium and chlorine gas ---> chloride.

lime + carbon dioxide ---> calcium carbonate (used to strengthen masonry)

water + carbon dioxide + light ---> glucose and oxygen (photosynthesis)

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small, big, or no change could occur in the phenotype. it could cause something as simple as a cats ears to curl backwards or something as frighting as death. it could also occur in the protien-coding area and have an effect on that but no effect on the amino acids. what has to occur is a changing in the hox gene or the control gene.

allowed for the prediction of the properties of missing elements.