"Michael S. Lorrey" <email@example.com> wrote,
>Hey, yeast are animals..... (they feed on plants, not sunlight)
Not quite. Yeast are fungus. Like mushrooms, they are not animals.
However, you are right that they can't make their own food and must
feed on other organisms to live. They do not fit well into the
plant/animal division. I like to think of them as undead plants.
Modern biology has five kingdoms: Monera, Protista, Plantae, Fungi, Animalia.
Kingdom Monera: primitive, prokaryotic (no nuclear membrane
separating DNA from cytoplasm, no other membrane-bound organelles),
single DNA strand, bacteria, blue-green "algae" bacteria.
Kingdom Protista: single-cell eukaryotic (nuclear membrane
separating DNA from cytoplasm, other membrane-bound organelles),
multiple linear strands of DNA (chromosomes), single-celled plants,
single-celled animals, single-celled fungi.
Kingdom Plantae: multi-cell eukaryotic, contain chlorophyll, use
photosynthesis to create food, cellulose cell wall, non-mobile, input
carbon dioxide, output oxygen.
Kingdom Fungi: multi-cell eukaryotic, no chlorophyll, no
photosynthesis, modified cell wall, non-mobile, input carbon dioxide,
Kingdom Animalia: multi-cell eukaryotic, no chlorophyll, no
photosynthesis, no cell wall, mobile, input oxygen, output carbon
-- Harvey Newstrom <HarveyNewstrom.com>
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