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If i remember correctly, the answer you are looking for is antigens.
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- Hannah ❤
Pioneer species are hardy species which are the first to colonize previously disrupted or damaged ecosystems, beginning a chain of ecological successions that ultimately leads to a more biodiverse steady-state ecosystem.
Explanation:
Positive : creating forest reserves, proper recycling of waste, etc.
Negative : Bush Burning, improper waste disposal, etc
They are colorless plastics