Question

हिन्दी वर्ण विचार और उच्चारण एक्सरसाइज फॉर क्लास 8​

Answer 1

Answer:

Although the vertebral column is perhaps the most obvious feature in vertebrates, it was not present in the first ones, which probably had only a notochord (flexible rodlike structure which plays a role in the development of the nervous system). The vertebrate has a distinct head, with a differentiated brain and three pairs of sense organs (nasal, optic, and otic [hearing]). The body is divided into trunk and tail regions.