Final answer:
The Tree of Life mosaic typically includes symbolic representations of the four Evangelists: Matthew as an angel, Mark as a lion, Luke as an ox, and John as an eagle, a group collectively called the Tetramorph.
Step-by-step explanation:
The Tree of Life mosaic mentioned seems to be referencing a religious or spiritual artistic work rather than a biological diagram. The important figures within such a mosaic, particularly in a Christian context, are likely to include the four Evangelists of the New Testament. These are represented symbolically through creatures in art and iconography. Matthew is depicted as a winged man or an angel, Mark is symbolized by a lion, Luke is represented by an ox, and John is portrayed as an eagle. This group is known as the Tetramorph, a term which comes from the Greek meaning 'four forms.'