1. angiosperms are the most abundant and important group of the plants. 2. what is the difference between seeds and spores? (seeds are where as spores are 3. plants are divided into two categories, non-vascular and vascular. describe the advantages of vascular tissue (xylem and phloem) in that category of plants.

1. Flowering Plants.
An Angiosperm is a plant that has flowers and produces seeds enclosed within a carpel. The angiosperms are a large group and include herbaceous plants, shrubs, grasses, and most trees.
2. Multicellular, Unicellular
The main difference between spores and seeds as dispersal units is that spores are unicellular, while seeds contain within them a multicellular gametophyte that produces a developing embryo, the multicellular sporophyte of the next generation.
3. Vascular tissue helps a plant naturally have nutrients traveling throughout it's body. Non-Vascular plants lack those particular tissues, but make up for it with a different, simpler type of tissue. Example, a sunflower vs. algae. 

1.989×10^30 kg is the weight of the sun.

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