The following four events occur during cell locomotion: Place them in the correct order. 1. The cell breaks its rear contacts with the substratum, retracting its trailing edge. 2. A part of the cell surface protrudes in the direction of cell movement. 3. Lower surface of cell protrusion attaches to substratum, forming temporary anchorage sites. 4. The bulk of the cell is pulled forward over adhesive contacts.

Explanation:

The correct order of  events in cell locomotion are:

2. A part of the cell surface protrudes in the direction of cell movement.

3. Lower surface of cell protrusion attaches to substratum, forming temporary anchorage sites

4. The bulk of the cell is pulled forward over adhesive contacts.

1. The cell breaks its rear contacts with the substratum, retracting its trailing edge.

Animal cell move by crawling. It is  a three step process that involves protrusion of the cell surface that attaches to the substratum, extrusion and retraction.