When true multicellularity evolved, what two specific mechanisms must have evolved to support it? (choose two.) ?

Two mechanisms that must evolve in order to make multicellularity possible are:

• Specialization of the cells which reffers specialization in function (not all cells do exactly the same thing, otherwise they would just be a group of cells or a colony)

• Adhesion, communication and cooperation-requires that the cells coordinate their activities by sending signals to each other. They shoul work cooperatively to develop their multicellular "body".

The correct answer will be-

1. Autonomous cell specification

2. Cell determination

Explanation:

The multi-cellular organisms have evolved from the unicellular organisms by evolving the two related mechanisms involved in the formation of multi-cellular mechanisms which are - cell determination and specification.

Cell determination is the ability of the cell to determine its fate depending on the chemical detected by the cell in a different region of the embryo. The chemical activates a series of events in cell-like activates a set of genes and intra and intercellular communication.

The Autonomous cell specification is the ability of a cell in which the cell is able to differentiate to carry out a specialized function without receiving any external signals.

Thus, Autonomous cell specification and Cell determination is the correct answer.