Difference between front and back part of tongue

Explanation:

The tongue is defined as a muscular organ, present in mouth that helps in mastication and swallowing of food. ... The front part of the tongue is narrow and thin whereas the back part of the tongue is wide.

the trilobite is used as an index fossil for various geologic time periods as specific types of the trilobites were present in different geological time periods. they are a group of marine arthropods belonging to the class of trilobita.

explanation:

1.the evidene of the reaction

2.yes

3.yes