What did experiments with the brown alga Fucus help to determine?
A. The thallus anchors the alga to the surface on which it lives.
B. A cell wall is required for the zygote to "remember" where a rhizoid should form.
C. Magnesium gradients are important for cell wall formation.
D. Light and gravity do not affect rhizoid orientation.
E. The cytoplasm is evenly distributed throughout the algal zygote.
Answer: B
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