What does an optional feature mean?

The wavelength of light used plus the numerical aperature governs? Is torque is a scalar or a vector quantity? A person eats mushrooms because he hears that they contain enzymes that are good for you. what is the end product of digesting mushroom proteins? What type of organic marcomolecule is formed by polymerizaion reactions between amino acids? What does inner to outer mean? What would happen if the world turned up side down? What does the children were covered wiith dirt from head to toe mean? The Atlantic ocean is growing by a few cm each year. Explain this phenomenon using plate tectonic theory? Which planet is 72 AU from the sun? Is ASMR a psychological effect? How much is 700 grams? Which physical property causes you to lean to one slide when the bus you are traveling in takes a sharp turn? Does the nuclear envelope re-forms during anaphase? You Always inspect the wire after stripping for any indications of what kind? Why do bacteria that form spores present a greater health risk than those that don't form spores? How do you use bs7671 wiring regulations when selecting wires and cables when carrying out tests on systems? What particle contributes a negligible amount to the atomic mass? Which of the atoms in the table are isotopes of krypton Kr? What is example of mutagenic agent? Is saguaro cactus a scavenger?