What anchored cach round beneath the water level?

Ok first of all could you give more information so I can edit this answer an actually make it an answer

Explanation:

there is a sequence and logical steps to give an answer of a trouble.

1) strategy is necessary to develop an project idea.

2) to study and know the environment where you are going to work ( ecosystem).

3)   the materials resources to built the ideas.

4) to give a priority order in the context that you study. in this case human needs.