यदि आद्य जननग्रंथि (primitive gonads) अंडाशय में विकसित होती हैं, या यदि कोई जननग्रंथि उपस्थित नहीं है, तो भ्रूणीय विकास के दौरान निम्नलिखित में से क्या होगा?

Which of the following statements best distinguishes neoteny from progenesis in animal development?

Which of the following is a signaling protein that plays a significant role in the development of limbs and the nervous system in human beings?