Living things change during their lives through?

All living things grow during their lifetime, whether it is an increase in size or a change in shape. Unicellular organisms usually just increase in size throughout their lives. There is little change in their features. Multicellular organisms typically undergo a process known as development.

micro/nanoscale topography surface exhibits many prominent properties and is extensively employed in biomedical device, microfluidic device and energy device fabrication. additionally, the clinical applications of biomaterials can be largely expanded with of nanostructured surfaces.

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.