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Environmental change is a change or disturbance of the environment most often caused by human influences and natural ecological processes. Environmental changes include various factors, such as natural disasters, human interferences, or animal interaction.
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It would be D hope this helps out.
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these creatures live only in salt-water environments.
Explanation:
These creatures are chordates, which are small thin shaped marine organisms. In this scenario it can be said that the scientists concerns are misplaced because they live only in salt-water environments. Therefore since they want to release the venom in a fresh-water environment there will be none of these creatures living there.