Which of the following is not a line of evidence supported by empirical evidence? 1. how similar DNA is between organisms
2. The length of the organisms life
3. where fossils are found
4. how similiat the organisms were as embryos

Ruby is conducting an investigation. an advantage of her design is that she can use a large range of variables, with that she can not be sure that one variable is the cause of another. what kind of investigation is ruby most likely conducting?