Final answer:
Water is crucial for seed germination and dispersal, while animals play a role in removing inhibitors from seeds. Different methods such as water dispersal or fire are needed to break dormancy.
Explanation:
Water is essential for seeds to germinate as it allows vigorous metabolism to begin and can leach away inhibitors in the seed coat, especially in desert annuals. Some seeds dispersed by animals may require passing through the digestive tract to remove inhibitors before germination. Species may require mechanical abrasion achieved through water dispersal or other methods such as fire to break seed dormancy.
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