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The first animals on Earth.

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16y ago

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What are the animals in which the anus develops before the mouth?

Animals in which the anus develops before the mouth belong to a group called deuterostomes. Examples include echinoderms (such as starfish and sea urchins) and chordates (which include vertebrates like humans). During early embryonic development in deuterostomes, the blastopore develops into the anus first, with the mouth forming later.


Do platypus have an anus?

All animals have an anus because all animals need to defecate.


Do koala have anus?

All animals have an anus because all animals need to defecate.


Is a rat a protostome or deuterostome?

A rat is a deuterostome. Deuterostomes are a group of animals that includes vertebrates like rats, as well as other animals such as humans. They are characterized by the way their embryos develop, which involves the blastopore forming into the anus first.


Where do animals lose their heat?

through the anus


What group of animals are called the 'first animals'?

Protozoa. For example, the Amoeba and paramecium.


The first land animals belong to which group?

Arthropods


Are there more than one anus on a human?

No. All animals have one mouth and one anus.


What group of animals came before the amphibians?

The major croup that came before animals arrived on this planet would be the Dinosaur group these animals were first on the planet known to man.


Are homo sapiens deuterostomes?

Yes, humans (Homo sapiens) are deuterostomes. Deuterostomes are a group of animals in which the blastopore (the opening formed during gastrulation) becomes the anus. This is in contrast to protostomes, where the blastopore becomes the mouth. Humans and other vertebrates belong to the deuterostome group.


Is there any dangerous animals in Uganda?

t rex philosorapters anus


Does the mouth or anus develop first on a baby?

In vertebrates as well as in echinoderms it is anus.So it is anus