SCIENCE
ZOOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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sponge
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cnidarian
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ameobocyte
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protozoan
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Detailed explanation-1: -Most protozoa consist of a single cell. They are animal-like because they are heterotrophs, and are capable of moving. Although protozoa are not animals, they are thought to be the ancestors of animals.
Detailed explanation-2: -Protozoa are one-celled animals found worldwide in most habitats.
Detailed explanation-3: -Answer and Explanation: Biologists believe that a primitive choanoflagellate protist is an ancestor of all animals because they are the first in the tree of evolution to display features that are characteristic of animals.
Detailed explanation-4: -All true animals-members of the kingdom Animalia-are eukaryotic multicellular organisms that share a single common evolutionary ancestor (Fig. 3.4). This last common ancestor was likely a single-celled organism similar to modern day choanoflagellates.