Lamarck wrote an important book talking about
a. the old age of earth.
b. how organisms could change.
c. the movement of the continents.
d. that fossils were extinct organisms.

B. How organisms could change. He has a wide study of animals and their behavioral changes to achieve perfection. From simple actions, they learn more skills. He explained the idea of use vs disuse and traits can be inherited. This contributed to the theory of evolution.

The correct answer is Mouth.

The food is first broken down by the help of enzymes present in saliva. There are various kinds of enzymes present in saliva such as amylase which coverts starch into maltose and dextrin. This is further broken down in small intestine. Almost 30% of starch present in the food is digested by salivary amylase.This chemical change that is conversion of starch into maltose and dextrin first takes place in mouth.