Vascular plants can be divided into three categories. these categories are a).flowering, nonflowering, and leafy. b).leafy, ground, and underwater. c).seedless, seed (nonflowering), and seed (flowering). d).seedless, seeded, flowering.

answer: a. same unit

explanation:

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.