The outer covering of an adult sea squirt is called the . mantle exoskeleton shell tunic Why are sponges considered...

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Biology

The outer covering of an adult sea squirt is called the .
mantle
exoskeleton
shell
tunic
Why are sponges considered metazoans and all otheranimals considered eumetazoans?
Sponges are prokaryotes, whereas other animals areeukaryotes.
Sponges lack true tissues, whereas other animals have truetissues.
Sponges do not have heads like other animals.
Sponges are colonial organisms, whereas other animals aremulticellular organisms.
What do bivalves and tunicates have in common?
They are both close relatives of vertebrates.
They are both soft-bodied lophotrochozoans.
They are both filter feeders.
They both have larvae with notochords.

Answer & Explanation Solved by verified expert

4.4 Ratings (746 Votes)

Question 1 answer tunic Explanation Sea squirts belongs to class Ascidiacea The Ascidiacea is a paraphyletic class in the subphylum Tunicata Ascidians are characterized by a tough outer tunic made of the polysaccharide cellulose Question 2nd answer See Answer

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		Sponges are prokaryotes, whereas other animals areeukaryotes.
		Sponges lack true tissues, whereas other animals have truetissues.
		Sponges do not have heads like other animals.
		Sponges are colonial organisms, whereas other animals aremulticellular organisms.

		They are both close relatives of vertebrates.
		They are both soft-bodied lophotrochozoans.
		They are both filter feeders.
		They both have larvae with notochords.