Which of the following particles has almost no mass?

What protects the lining of the stomach from acidic gastric juices?

Which element provides strength to the exoskeleton of clams and oysters

How is the national wildlife refuge system similar to the pacific region coastal program? a. both programs are concerned with providing habitats for wildlife b. both programs are primarily concerned with preserving fish species c. both programs have set aside 150 million acres of land d. both programs are under the u.s. fish and wildlife service