MCQ
True coelom appeared first in the course of evolution in
- AAschelminthes
- BChordata
- CEchinodermata
- ✓Annelida
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$(i)$ Crossing over
$(ii)$ Synapsis
$(iii)$ Terminalisation of chiasmata
$(iv)$ Disappearance of nucleolus
$Y -$ $QRS$ waves represent depolarization of atria