Classification

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Ascidians are sac-like marine organisms. Their larvae have well-developed brains and dorsal nerve cords. This suggests that ascidians should be classified with the —

One method of determining the classification of an animal is by comparing the amino acid sequence. Which of these animals most closely resembles this unknown animal? Met-Gly-Ser-Tyr-Tyr-Arg-His-His-Glu-Lys-Asp

A biologist has just discovered a new life form. The newly described organism is multicellular, does not carry on photosynthesis, and absorbs nutrients from the environment. It is composed of eukaryotic cells with cell walls. Which kingdom is best?

Escherichia coli is the scientific name of a bacterium. What category of classification is Escherichia?

Which of these organisms contains no specialized cells?

During a trip to a rain forest, a scientist discovered a new organism living near some rotting logs. The scientist observed that the organism had moist skin, no hair, and an internal skeleton and that it laid eggs. This organism was probably a -

According to the biological definition of a species, which organisms listed below would belong to the same species?

What structure is common to all five kingdoms of living organisms?