Organisms attached to a substratum generally possess:

  • A
    Radial symmetry
  • B
    $A$ single opening for the digestive tract
  • C
    Asymmetrical body organization
  • D
    Surface cilia to create water currents

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Which type of body plan is shown in the given figure?

In the given chart,what do $a$ and $b$ represent respectively?
$(i)$ Acoelomate
$(ii)$ Hemichordata
$(iii)$ Agnatha
$(iv)$ Pseudocoelomate
$(v)$ Gnathostomata
$(vi)$ Cephalochordata

What is the difference between direct and indirect development?

Which of the following phyla are included in the group $Enterozoa$?

$A$ complete digestive tract is defined as ........

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