Which of the following parts of a plant is (are) not digestible by humans?

Explanation:

Your body is unable to digest cellulose and, as a result, it passes through your digestive tract unchanged and is eliminated in bowel movements. Bran, legumes, nuts, root vegetables and apples are particularly high in cellulose and hemi-cellulose

There are many things, which scientists can learn directly from a fossil, some of them are as follows:  

1. One can know about that when some groups of animals got evolved and who were their ancestors.  

2. One can become familiar with the kinds of organisms thrived at what times and where they lived.  

3. One can know something regarding the species, which no longer lives, comprising what they ate, their appearance, and other kinds of traits.  

4. One can know more about the drifting of continents by comparing it with the places where the fossil species have been found.