Rust results from iron’s reaction to oxygen. an iron nail gains mass when it rusts. how does this reaction support the law of conservation of mass

How does the study of genetic disorders such as pku biologists understand normal alleles?

Anurse is in the dining room and overhears a new nurse tell a client with body dysmorphic disorder that she's much too thin and must eat more before she can go home. the client bursts into tears and runs out of the dining room. what is the best way for the nurse to address this situation?

If a strand of dna has 35% thymine. what is the percentage of cytosine, adenine, guanine?