Cephalization and a coelom are ancestral for all tiploblastic animals. Some anim

Question

Cephalization and a coelom are ancestral for all tiploblastic animals. Some animals have lost the coelom at some point in their ancestry. O True False Save Question 4 (1 point) Select all statements that accurately describe deuterostomes. Embryonic development begins with a blastopore that will eventually become the anus a Possess intemal body cavities include echinoderm animals such as starfish. ' Embryonic development begins with a blastopore that will eventually become the mouth. Deuterostomes are polyphyletic. They all grow by molting

Explanation / Answer

Triploblastic animals:

Triploblastic is the blastula which has 3 germ layers, ectoderm, endoderm and mesoderm.

Cephalisation:

Presence of nervous system, sense organs at the anterior part of the body forming head and brain is known as cephalisation.

Coelom:

Coelom is the fluid filled body cavity lining the tissue created by mesoderm. Coelom protects the internal organs.

Question:

Cephalization and a coelom are ancestral for all triploblastic animals. Some animals have lost the coelom at some point in their ancestry.

ANSWER:

False – cephalisation and coelom are important feature in the triploblastic animals and it is not derived from ancestral species. Ancestor of triploblastic animals do not have coelom.

Deuterotsomes:

In Deuterotsomes the first pore blastopore becomes the anus.

In protostomes the first pore blastopore becomes the mouth.

There are 3 major deuterotsomes

Question:

Select all statements that accurately describe deuterostomes.

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