1) What organism is thought to be the first multi-cellular animal?
The Ancient Sponge
2) How is it similar (3 examples) and different (3 examples) from animals today?
Similarities:
-Cells are held together by collagen
-Reproduces sexually - has the production of both gametes
-feeds itself
Differences:
-No nervous system
-Regenerate
-Spicules
3) How do scientists know it's an animal?
Sponges eat, reproduce, have a "heart" beat, and has cell communication in terms that it is similar to that of animal cells.
4) What evidence do scientists have to prove that other animals (multi-cellular) evolved from this organism?
The sponge's genetic code - DNA; along with the tracing of the animal tree through genetic sequencing.
5) What more do you want to know?
I would want to know the stages of the evolutionary process in which an organism evolved from in terms of their genetic sequencing from a simple sponge into a more complex organism, such as a squid or an octopus.
1 comment:
hey, i cannot see your pictures!
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