Describe some characteristics used to group organisms into different kingdoms

This aquarium exhibits biotic and abiotic factors in an aquatic environment. one of the abiotic factors is

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.

Will someone me with this.. specialized cells which perform a particular function form: tissues organs or organism