Nerve activates contraction

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http//botit.botany.wisc.edu/images/130/Meiosis/Li
lium_microsporogenesis/Phragmoplast_Cell_Plate.low
.jpg
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Figure 29.3 Apical meristems of plant shoots and
roots
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Figure 29.4 Embryos of land plants Marchantia
(left), Shepherd's purse (right)
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Figure 29.6 Alternation of generations a
generalized scheme
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Figure 29.7 A fern spore
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Figure 29.9 Gametangia Archegonium of
Marchantia (left), Anteridium of a hornwort
(right)
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Figure 29.10 Cuticle of a stem from Psilotum (a
pteridophyte)
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Figure 29.11 The stem of Polypodium, a fern (a
pteridophyte)
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Table 29.1 Ten Phyla of Extant Plants
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Figure 29.15 Bryophytes
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Figure 29.16 The life cycle of Polytrichum, a
moss (Layer 3)
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Figure 29.16x Moss life cycle
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Figure 29.19 Sphagnum, or peat moss Peat bog in
Oneida County, Wisconsin (top), closeup of
Sphagnum (bottom left), Sphagnum "leaf" (bottom
right)
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Figure 29.24b Fern sporophyll, a leaf
specialized for spore production
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Figure 29.23x2 Life cycle of a fern sorus
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Figure 29.21x1 Lycophyte
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Figure 29.21 Pteridophytes club "moss" (top
left), whisk fern (top right), horsetail (bottom
left), fern (bottom right)
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Figure 29.21x2 Horsetail
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Figure 29.23 The life cycle of a fern
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Figure 29.23x6 Life cycle of a fern gametophyte
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Figure 29.24a Fern sporophyll, a leaf
specialized for spore production