Which is not an example of a human organ system? a) extracellular system b) digestive system c) nervous system d) respiratory system

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.

Which description provides the best objective summary of the article in the passage?

Define adaptation. why do organisms adapt? give an example.