Spirogyra are green algae that can reproduce sexually. Which of the following features identifies reproduction in Spirogyraas sexual reproduction versus asexual reproduction? A. The cells of the parent algae have a nucleus.

B. Each offspring contains chloroplasts.

C. Several offspring can be reproduced at the same time.

D. Genetic material is contributed by two parent cells.

By water evaporation from the leaves is created a negative pressure at the top of the tree that promotes the ascension  of the water through channels that are called xylem. there are also two molecule forces that are involved: the intra-water molecules cohesion (water molecules stick to each other) and the adhesion when the water molecules stick to the channels they are running in. this is what enables water to go from the roots to the top of a tall tree.