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Anonymous
Question: We classify Algae as protists, but Sponges are animals. Shouldn't Sponges be protists as well? What makes them different? Why aren't Algae plants?
>> Anonymous
Because sponges do have specialized cells. Not to mention that there is now evidence that they evolved from a much more complex animal. Next question.
>> Anonymous
We classify sponges as protists, but algae are animals. Shouldn't algae be sponges as well? What makes them sponges? Why aren't sponges algae?
>> Anonymous
Protists are eukaryotic microbes. Sponges are multicellular. Sponge embryos pass through a blastula stage which only animals do.

Algae aren't considered plants because they lack the structures that qualify something as a plant.
>> Anonymous
Because they aren't.
>> Anonymous
>>346049
Bam?