Scientific knowledge must be supported by evidence. An idea that is not supported by evidence but is made to appear scientific in order to make people think it is a part of science is called pseudoscience. Pseudoscience cannot be considered scientific because pseudoscientific ideas lack evidence. Which of the following ideas is considered scientific? A. Crop circles are made in fields by alien organisms. B. The way the stars are positioned can be read to know the future. C. Genes are made up of DNA and affect how an organism looks. D. Bigfoot lives in the forest and travels around the U. S.