Describe the problem the scientist who designed the artificial mangrove structure wanted to address

According to piaget, children have acquired the cognitive skill of conservation when they're able to a. understand that six ounces of liquid in a jar and six ounces in an elongated tube are equal. b. understand the viewpoint of other people. c. relate objects around them to their own needs. d. realize that the term heavy describes an object one way and the term big describes it another way. it is not b nor c. did this 2 x wrong..

What type of competition exsist between two species. turtles and fish

What is the problem in this article? what solution does the article propose?