Which of the numbers on this figure indicates low pressure/high temperature metamorphic conditions? 
Definitions:
Gnetophyta
A division of gymnosperms comprising woody plants with some angiosperm-like features, including the genera Ephedra, Gnetum, and Welwitschia.
Gametophyte
The haploid phase in the life cycle of plants and algae that produces gametes for sexual reproduction.
Pollen Grain
The immature male gametophyte of seed plants (gymnosperms and angiosperms) that produces sperm capable of fertilization.
Microsporocytes
Cells in plants that undergo meiosis to produce microspores, which eventually develop into male gametophytes or pollen grains.
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