‏A solution contains either Cr3+ or Ni2+ ion. Describe a reaction with a single reagent that will identify which ion is present.

Name the following: (a) category of pathogen that causes diseases, like common cold and mumps. (b) the microorganism that requires a host to produce.

Creation of an unnaturally uniform sample to represent a diverse populationcan be avoided by: a. including only willing b. asking another scientist for .c. choosing only identical participants.d. selecting individuals at random.

Based on anatomical similarities, to which modern animal is dr. digger’s creature most closely related?