List two external features that are common to all arthropods Describe the circulatory system of an...
List two external features that are common to all arthropods
Describe the circulatory system of an arthropod
What is the one unique anatomical feature of the echinoderms?
How do the body plans of echinoderm larva and the adults differ?
List the four features all chordates share at some point in their development.
Homework Answers
All the arthropods have the jointed appendages and hard exoskeleton on their body surface. These are two external features of arthropods.
The circulatory system of arthropods is of open type in which the blood flows in the body cavity directly. The body cavity is known as sinuses. Whole body is bathed with blood directly.
The presence of water canal system is a unique anatomical feature of echinoderms. It is also known as ambulacral cavity. Connected to podia, it helps in locomotion of echinoderms.
Echinoderm larva shows the bilateral symmetry while adults show the radial symmetry. It is because the larvae don't have the radial branches emerging from body.
The four unique features which all the chordates show at same in their development are -
Presence of a notochord,
Post anal tail,
dorsal hollow nervecord,
Pharyngeal slits.
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