Acid rain is caused by a chemical reaction, due to when the two compounds sulfur dioxide and nitrogen are released into the air. Therefore, the answer is 4!
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Because if there are no animals we can't live, we purposely mix breeds maintaining more than one resource. <span>Maintaining biodiversity has a direct economic value to humans, as well as indirect economic value because our ecosystem is affected by any imbalances in the environment. For example, a lack of trees will mean we don't have enough oxygen to breath. A lack of fish will mean many animals that feed of sea creatures will die.</span>
Answer:
the answer is d
Explanation:
the seed coats job is to provide nutrients and to protect the seed
so the only answer could be D
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Ice floats because it expands (kid version). The molecules are less dense in ice than when water (H2O) and the structure is different.
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Loses or gains electrons.
