Is there anyone ans these questions please? 16. Microorganisms respond to nutrients, change in environmental conditions etc. This is: a. growth b. coordination c. irritability d. movement 17. Animals and non-green organisms feeding only on primary producers are known as 18. Homo sapiens have the largest brain case of the genus Homo. As a result, they have the capacity of complex speech. a. True b. False 19. is a special kind of movement initiated by the organism itself..