Describe the traits of adaptation to the habitat, manifested in the external structure of bivalve molluscs.

1. Rivers and lakes. Bottom sedentary animals.
2. The presence of siphons allows you to filter water, feeding on the smallest particles. The presence of a leg is used for walking in sand and silt. The denticles and sticky filaments in larvae for development and dispersal with the help of fish.
3. The protective coloration of the shells of molluscs can change with a change in the color and quality of the soil.
4. Idioadaptation, aromorphoses have arisen in the process of evolution and have become hereditary.