What cell has a membrane and ribosomes

In numbering carbon atoms in the parent chain of a hydrocarbon, why would you number from right to left, rather than left to right

Explain how the integumentary system plays a crucial role in the ability to maintain homeoestasis

Ageologist determines that a sample of a mineral can't be scratched by a steel nail but can be scratched by a masonry drill bit. based on this information, the sample mineral has to be softer than a. orthoclase. b. fluorite. c. apatite. d. corundum.