there are three
3
There are only two layers.Endoderm layer and ectoderm layer.
forty-six layers
organ system
2 layers of lipids.
71 microscopic layers
2 layers
3
flame cell
Three
2
Many flatworms can detect changes in the amount of light in their environment using groups of cells called photoreceptors. These cells are sensitive to light and help the flatworms navigate and respond to their surroundings based on light levels.