so in this diagram we can see that heart receives only impure blood gave it out to different organs ,,,,so what is the purpose of heart in this circulatory system.is nothing will be affected if there was no heart because the O2 comes from outside
As we know that here were no mammals when tapeworm has been evolved so where doees these tapeworms live at that time???
platyhelminthes are acoelomate but in your question bank. 2nd question you have given that annelids are acoelomate...?
Viper is viviparous right?