Which of the following organisms is made of the most complex cells?
А
plant
B
virus
C
archaea

The organism that is made of the most complex cells is A. plant

A Cell is simply known as the most basic unit of life. It should be noted that plants have complex cells due to the fact that they have different roles and structures that are vital for the survival of the plant.

Some of the cells tahr can be seen in plants include parenchyma, xylem, phloem, collenchyma, sclerenchyma cells, etc.

Cells are vital in plants as they help transport water and minerals to the rest of the plant from the roots. They're also vital in making the plants healthy.

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A. Plant

Explanation:

Plants have some of the most of complex cells of living organisms because they have different roles and structures to enable the plant to survive.

These include cells like the Parenchyma, Collenchyma, Sclerenchyma, Xylem and Phloem cells. Xylem cells for instance are complex cells located within the vascular tissues of plants and help transport water and minerals to the rest of the plant from the roots. Xylem cells look long and tracheal which is to enable them carry out the aforementioned roles.  

they float because they are less dense than the water itself

something denser than water, like a rock, will sink to the bottom