Final answer:
Seaweeds adapted to live on rocky shores exposed to heavy wave action have strong holdfasts, flexible fronds, and special features like air bladders. Seaweeds adapted to less exposed rocky shores may have shorter, wider fronds, thicker cell walls, or a higher density of chloroplasts.
Step-by-step explanation:
Seaweeds adapted to live on rocky shores exposed to heavy wave action have certain characteristics. These seaweeds usually have a strong holdfast that allows them to anchor firmly to the rocks, preventing them from being dislodged by the waves. They also have flexible and streamlined fronds that can withstand the force of the waves without breaking. Additionally, they may have specialized features like air bladders that help them stay buoyant when exposed to air during low tide.
In contrast, seaweeds adapted to live in less exposed rocky shores may have different adaptations. They may have shorter and wider fronds that can tolerate lower wave energy. They may also have thicker cell walls or a higher density of chloroplasts to maximize photosynthesis in lower light conditions.