Answer: d- because a model is never exactly the same as the thing it represents
Hydrogen bonds hold together the atoms in a water molecule.<span> A single water molecule is made up of two hydrogen atoms and one oxygen atom</span>
75% species go extinct to be considered a mass extinction
Answer:
They are all important parts of an ecosystem. Producers are the green plants. They make their own food. Consumers are animals and they get their energy from the producers or from organisms that eat producers.
