Not entirely correct, but it is true that we have three types of cone pigments: red-sensitive, green-sensitive and blue-sensitive. As you can see in the graph on this page http://science.howstuffworks.com/eye3.htm, the sensitivities of the pigments overlap: the eye can see almost any gradation of color between the peaks.Daevren said:Humans see in three colours.
Scientists use a rigorous process of experimentation and data analysis to ensure the accuracy of their findings. This includes carefully designing experiments, controlling variables, and replicating results. Additionally, scientific findings are often subject to peer review and replication by other scientists, adding to the confidence in their accuracy.
Scientists use evidence and logic to support their conclusions. This evidence comes from the results of their experiments and observations, which are then analyzed to draw logical conclusions. Additionally, scientists often conduct multiple experiments and gather data from various sources to support their conclusions.
Scientists use rigorous and standardized methods to conduct their experiments and gather data. These methods have been tested and refined over time to ensure reliability. Additionally, scientists follow strict protocols and document their methods in detail, allowing for replication and verification by other scientists.
Scientists use theories to explain and make predictions about natural phenomena. These theories are based on evidence and have been tested and refined over time. Additionally, theories are constantly being evaluated and modified as new evidence is discovered, ensuring their accuracy.
Scientists use objective and unbiased methods to conduct their experiments and gather data. This includes controlling variables, using randomization, and eliminating personal bias. Additionally, results are often reviewed and replicated by other scientists to ensure objectivity.