A major evolutionary constraint on the height growth of gametophytes in ferns, lycophytes, and bryophytes is thought to be imposed by:
A) the reliance of swimming sperm on environmental water.
B) a lack of genes encoding developmental pathways for a vascular system.
C) insufficient photosynthetic ability to support growth in height.
D) the dependence of the gametophyte on the sporophyte for nutrition.
Correct Answer:
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