Because all animals must take in nutrients from their environment, the nutritional mode of animals is called

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Heterotrophic means organisms that obtain their nutrients by consuming other organisms or organic matter. Animals cannot generate their own food through photosynthesis and thus, they depend on other organisms for food. Therefore, the nutritional mode of animals is heterotrophic. The other options are not applicable to animals. Photoheterotrophs are organisms that use light as an energy source but obtain carbon and other nutrients from organic sources. Photoautotrophs are organisms that use light as an energy source and produce organic compounds from carbon dioxide. Chemolithotrophs are organisms that obtain energy from inorganic compounds, and chemoautotrophs are organisms that produce organic compounds from carbon dioxide using energy derived from chemical reactions.

Because All Animals Must Take in Nutrients from Their Environment