The small closable openings in leaves and stems that regulate gas exchange are called _______.
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Q79: The first vascular plants were probably
A) rhyniophytes.
B)
Q80: Lycophyte-fern forests arose in the Devonian period
Q81: Plants with an unequally branching independent sporophyte
Q82: Consider the following facts:
Q83: Which evidence most strongly suggests that heterospory
Q85: The evolution of heterospory occurred independently several
Q86: If an organism possesses the photosynthetic pigment
Q87: Land plants, sometimes referred to as _,
Q88: In a heterosporous life cycle, the microspore
Q89: Despite sharing the common name _, all
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