Most Biologists Agree That the Most Recent Common Ancestor of All

question 58

Multiple Choice

Most biologists agree that the most recent common ancestor of all animals was probably a ____, an idea first proposed by Ernst Haeckel in 1874.

• A) jellyfish
• B) ciliated protozoan
• C) sessile sponge
• D) single-celled chytrid
• E) colonial, flagellated protist

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