In a sample of pond water, a new organism is identified with the following characteristics: it consists of 70 cells surrounded by rigid cell walls which join the cells together. inside each of the identical cells, there are mitochondria and chloroplasts. such an organism would most likely be classified as a

Eukaryotic photosynthetic colonial organism

Explanation:

According to the given information, the cell of the organism has membrane-bound organelles such as mitochondria and chloroplasts. The presence of membrane-bound organelles in cells is the characteristic feature of eukaryotic organisms.

The presence of chloroplasts in the cells makes the given organism photosynthetic. Chloroplasts are the double membrane-bound organelles and serve as site for photosynthesis.  

Many identical cells of a colonial organism are stick together to form different shapes. Since 70 cells are found joined together, the given organism is colonial.