In which type of research is one or more variable deliberately changes?

A) a study case
B) a survey
C) a observation
D) an experiment

Which describes radioactive decay of a substance

Why is it important that fibrin is insoluble in water?

Immature bone cells, or osteoblasts, manufacture a protein called osteoid as well as several hormones. because of this, we would expect osteoblasts to contain numerous a) nuclei. b) ribosomes. c) lysosomes. d) golgi bodies.