Darwin also suggested a mechanism for evolution: natural selection, in which heritable traits that help organisms survive and reproduce become more common in a population over time. A heritable trait is one that's passed on from parents to children by way of genes.
Answer: The correct option is c. red, green and blue.
Red, green and blue are primary colors. The theory of trichromatic theory is derived from the color mixing and the color matching explanations. According to the experiment in this theory, the individual person having normal vision of color requires three wavelengths of the primary colors to match with any other color in the visible spectrum. This led to finding of color vision which is based on the activities of three different receptors each having a different sensitivity of the peak. The three receptors are each sensitive towards colors red, blue and green respectively.
This statement is false. The open ocean, seafloor, and coral reefs are not all examples of habitats with high rates of primary production. Instead, these are examples of marine habitats that is used to support and give shelter for the marine living things
Answer: The NEGATIVE CONTROl is the test tube that is filled with ONLY distilled water.
Explanation:
A negative control of an experiment is carried out alongside the main primary experiment except that the treatment is changed to something that is predicted to have no result. In the negative control, the student does not expect any response. This would help the student compare the result of a new experiment against an already known existing results.
Analysing the experiment carried out by the student, She filled two test tubes with distilled water and placed a piece of Elodea in one of the tubes, leaving the other without a plant. The other test tube that contains only distilled water is the negative control because she wasn't expecting any result from it. It's also served as a control sample to the primary experiment. This is observed as she blew in each tube to add carbon dioxide, which caused the distilled water to become more acidic. This would help the student know that the that experimental results are valid and to ensure that time is saved.
