4 Study of types of scales in fishes Placoid scale, Cycloid scale, Ctenoid scale & Ganoid 

Great explanation.. These information encourage my previous knowledge..

Useful video 👍

Is groove present anterior or posterior side?

Ap ny reading hi ki hai....reading tw hum bhi Kr sakty Hain....ap ki trah k teachers humari uni mein bhi Hain literally Kuch smjh nhi aata aisy students ko

Ganoid scale is harder

You just read the material only you should explain the material so that student should learn and understand the students is here to understand not for reading 👍