Which of the following structure is found in blastula
Segmentation cavity
Notochord
Gill
Tail
Which of the following is true regarding sperm ?
Which of the following represents a condition, where the motility of the sperms is highly reduced?
Blood flowing in umbilical cord is
Identify the correct option ($A$), ($B$), ($C$), ($D$) with respect to spermatogenesis.
The distal narrow end of the uterus is called......