If the cell of an organism contains a nucleus, then the organism must be in what

Ageologist determines that a sample of a mineral cant 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

If you have a difficult time knowing where your hand is without looking at it you may be having a problem with your what ?

What type of appendages do sponges cnidarians roundworms annelids mollusks arthropods echinoderms and vertebrate have? jointed, not jointed, absent