Materialism, in this sense, refers to the theory that physical matter is the only or fundamental reality, that everything in the universe, including all life, came into existence without any supernatural intervention in the process.
जानवरों में किए उत्परिवर्तन के नतीजे और भी बदतर निकले, इसलिए इस तरीके को पूरी तरह छोड़ दिया गया ।