A because a physical change , changes the appearance. the multiple choice question is A.
Mutualism, both of the animals benefit from the relationship.
Explanation:
The flow of the river is dependent upon the position along the stream in terms of the gradient. Near the top of a high gradient, the flow will be less than that near the bottom. Likewise, the steeper the river's gradient, the faster the flow of water (due to the pull of water down the gradient by gravity).
Dear public, our ecosystem is being ruined and we need to stop it, i think you should do something about the littering and loitering in our community and in the U.S. it would help a lot of people if you made a law against it or if we went out and all did community service and helped pick up. if you don't like these ideas we could protest, but all me and my fellow people ask is that you help our <span><span>ecosystem for better lives for everyone! yours truly, citizen</span></span>
