Aristotle was limited in his ability to characterize organisms because
(A) he did not have any microscopes
(B) there was no knowledge of evolution
(C) he could only distinguish organisms by shape, structure, and habitat
(D) there was no way to observe internal organs
(A), (B), and (C) are correct. Without microscopes, Aristotle only knew about plants and animals and could only distinguish organisms based on macro details like shape and structure. At the time, people also believed organisms were fixed and did not account for evolutionary change. (D) is incorrect because people could easily dissect an animal.