Rheostats are “often used as power control devices, for example to control light intensity (dimmer), speed of motors, heaters, and ovens.”
How can you be certain, for instance, that you, horned lizards, and brook trout share a common chordate ancestor?
A review of the topoisomerase family of molecular machines that repair DNA ignores where they came from. Another article tries but has no answers.
As usual, evolution-talk is inversely proportional to the amount of detail presented about cellular workings.
Compare the latest project to sequence everything to other megaprojects that may or may not answer evolutionary questions.