Choanoflagellate
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Choanoflagellates are a group of free-living unicellular and colonial flagellate eukaryotes considered to be the closest living relatives of animals. The name refers to the characteristic funnel-shape
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The calcium homeostasis of a modern sperm cell (B) looks very similar to that of an ancient choanoflagellate (A). The hormone precursor farnesol is very ancient in evolution, and its use goes back at least as far as the choanoflagellates which preceded the animals.
Salpingoeca sp. section under TEM
Codosiga sp. under light microscopy, isolated from Siberian buried soils.
Animal
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Animals are multicellular, eukaryotic organisms belonging to the biological kingdom Animalia. Animals consume organic material, breathe oxygen, have muscle cells, can reproduce sexually, and grow from
Choanoflagellate
…Choanoflagellates are a group of free-living unicellular and colonial flagellate eukaryotes considered to be the closest living relatives of animals. The name refers to the characteristic funnel-shaped "collar" of interconnected microvilli and the presence of a flagellum. Choanoflagellates are found…
Sexual reproduction is nearly universal in animals, such as these dragonflies.
Predators, such as this ultramarine flycatcher (Ficedula superciliaris), feed on other animals.
Hydrothermal vent mussels and shrimps
The blue whale is the largest animal that has ever lived; it can be up to 33.6 metres (110 ft) long.