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Lamb is not only food, it's also clothing, soap components (lanolin), etc.

This is my main problem with the opening argument: most animals are multi-use, unlike most plants.

Most plants have an incredible array of uses, look at palms, corn, soy, and wheat as examples among a wide array of others. You can use them as food, but corn is used as a plastic and fuel alternative, soy is commonly used as an emulsifier, and different varieties of palms are being used in soaps and detergents. We are capable of really incredible things with modern science.

Its not the 17th century anymore, we can make those things from non-animal components.

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