Proteins are used for many structural functions such as in the acting and myosin in muscle or as a part of the cytoskeleton scaffolding that maintains cell shape. what other main function do proteins serve?

How is the life cycle of seedless vascular plants different from the life cycle of nonvascular plants? the adult form of each seedless vascular plant has xylem and phloem. the gametophyte stage is lacking in the life cycle of seedless vascular plants. the sperm of seedless vascular plants do not need to swim in water. the zygote of each seedless vascular plant forms before the egg is fertilized. asap