Which of the following is not characteristic of all nonvascular plants?
they produce seeds.
they produce spores.
they require water for sexual reproduction.
they have a life cycle that involves alternating generations.

Among the choices listed, the one that is not a characteristic of all nonvascular plants is "They produce seeds.". The main difference between vascular and nonvascular plants is the presence of Xylem and Phloem which are tubular tissues used to transport water, food, ans minerals throughout the plant. Plants that have Xylem and Phloem are considered vascular plants. 

Cuz i said so. which gives it to b