I would say that a bar graph will most helpful.<span>≧◡≦</span>
It is b because we know that we learn these in science
the causes of most of them are unknown. Some birth defects are considered to be physical, while others are thought of as functional. Physical birth defects result in the malformation.
Without concentration you can't have diffusion, because diffusion is basically the spreading out of molecules which are concentrated, or compacted.
