Final answer:
The key feature of seed plants that facilitates life on land is the pollen option (b). Pollen grains carry the sperm of the plant and can travel far from the parent plant. Seeds protect the embryo and allow for dormancy, ensuring germination occurs under optimal conditions.
Step-by-step explanation:
The key feature of seed plants that facilitates life on land is pollen. Pollen grains are male gametophytes that contain the sperm of the plant. They are encased in a protective coat that prevents drying out and mechanical damage. Pollen can travel far from the parent plant, spreading genes and avoiding competition. This allows seed plants to reproduce without relying on water for fertilization.
Another important feature is the presence of seeds. Seeds protect the embryo and provide nutrients for its initial growth. They also allow for dormancy, enabling germination to occur when conditions are favorable.
Seeds are dispersed through various means, allowing plants to colonize new areas and ensure the survival of the next generation.