<span>It is not
surprising that organisms from different specifies have similar gene length
because rainbow trout, brown trout and common carp are all under the phyla
Chordata. Rainbow trout and brown trout are in the same genus and species so it
makes sense they have similar gene characteristics. </span>
In spermatogenesis,from a single spermatogonia 4 haploid sperms are produced after meiosis (100% efficiency).But in case of oogenesis,from a single oocyte only one is transformed into ovum even after meiotic division(25% efficiency)
I think it might be D Circulatory