When elongated, tube-shaped cells from the lining of the intestine are treated with a certain chemical, the cells sag and become rounded. the internal structures disrupted by this chemical are probably

The internal structures disrupted by this chemical are probably VACUOLES.

Explanation:

A vacuole is a large membrane-bound vesicle in a cell's cytoplasm.

The central vacuole of a cell houses the digestive processes which includes chemicals that come to attack the cell; also it helps the cell regulates it's water concentration during changing environmental conditions.

vacuoles are present in the absorptive cells (enterocytes) covering the wall of the intestine

this transfer is call conjunction

clumped distribution, because you'de have all of the population gathered in a relatively small are.

it's the most common because it provides protection and a mate for reproduction

example: humans, seeweed, cattles, etc.