Here's why:

* Lack of Cell Walls: Plant cells have rigid cell walls made of cellulose. Animal cells, including insect cells, do not have these cell walls.

* Lack of Chloroplasts: Plant cells contain chloroplasts, which are organelles that allow plants to perform photosynthesis. Insects do not have chloroplasts and must obtain their food from other sources.

* Mode of Nutrition: Insects are heterotrophs, meaning they must consume other organisms for energy. Plants are autotrophs, producing their own food through photosynthesis.

Therefore, insects have animal cells with the characteristics typical of animal cells, such as the lack of cell walls and chloroplasts.