Question
on the proposed basis.
General characteristics of the Chordal type.
Presumably, they originated from ...
o Have ... an axial skeleton - ... Most have a chord only at ... stage, then it is replaced by a spine.
The central nervous system (CNS) is represented by ..., located ... by a chord.In almost all chordates
, the anterior part of the neural tube grows and forms the brain
Secondarily..., the body cavity ... (as a whole).
Circulatory system..., heart on... side.
On the walls of the pharynx there are ... cracks in all chordates at the embryonic stage.
look at the ascidia and the tunica and their larvae. The features of these amazing animals were studied
by the outstanding Russian biologist A.O. Kovalevsky.
These animals undergo amazing changes throughout their lives. An adult individual of ascidia is
a headless gelatinous tube attached to an underwater rock. But its larva is very agile and
hunting for a tadpole with a distinct tail and head. An elastic chord passes through the body of the larva
. The shell larva has similar features.
What type do these amazing animals belong to?
Ascidia
Head bubble
Neural tube
Fragient4ia9
Chord
Answer
Ascidia belongs to the Chordal type.