Asubstance forms when two or more elements combine and lose their distinct properties is

Which one is best adapted to live in open water in the epipelagic zone, and why? fish a because of its elongated body and powerful tail fish b because of its flattened shape and eyes on the dorsal side fish c because of its streamlined shape and lack of pectoral fins none of these because they are all sedentary

In the diagram, δgef and δhef are congruent. what is the value of x?

Which of the following statements about the us federal boundaries is true