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(D) Nonpoint source pollution is difficult to regulate, because its source is difficult to track.
Answer:Anatomía. La anatomía es una de las principales ramas de la biología que permite a un individuo comprender la estructura y las partes de los organismos, incluidos los animales, los seres humanos y los organismos vivos.
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It is D. Sponges can move but not all, they are soft not hard so not B. They do not make food they absorb it so it D
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In systems, the relationships between individual parts may be more important than the parts. An ecosystem is not just a collection of species, but includes living things interacting with each other and their nonliving environment. In the systems view, the "objects" of study are networks of relationships.
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Answer:
option A:The kinase is active only when Tyr527 is dephosphorylated and Tyr416 is phosphorylated.
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