The Pteridopyhta, phylum of seedless vascular plants has about 1000 known living species, including those in the genera Lycopodium and Selaginella; the gametophyte of some of these species cannot photosynthesize, and instead uses mycorrhizae to obtain nutrients.
Explanation:
The pteridophytes, most advanced group of plant among the cryptogams i.e. seedless plants.
They are first land plants that have developed a well defined vascular system.
Ferns, horsetails etc are common members of this phylum.
You need to clarify the question. For a Healthcare provider chest compression are done on the chest slightly to the left and down. They must be at a depth of 2 inchs, a rate of 100-120 per minute, a comp to vent ratio of 30:2, with adequate and equal rise and fall of chest, and allowing for adequate cheat recoil. Distraction should be limited to 10 sects and under
When earth worms bring fine rocks to particles they do it in mechanical weathering
