True placenta is absent in all marsupials except

True placenta is found in

Which of the following characters is absent in all chordates except mammals ?

Which of the following characters is absent in all chordates except mammals ?

Which of the following characters is absent in all chordates except mammals ?

Which of the following characters is absent in all chordates except mammals ?

All are true about spinal cord except :–

a^(0)=1 is true for all a except

Human placenta is considered to be a temporary endocrine gland and secretes all of the following hormones except one

All the following statements about cannabinoids are true , except