Why Have Biologists Hypothesized That the First Land Plants Had

question 15

Multiple Choice

Why have biologists hypothesized that the first land plants had a low, sprawling growth habit?

• A) Only fossilized plants exhibit this habit.
• B) The ancestors of land plants, green algae, lack the structural support to stand erect in air.
• C) At the time of the first land plants, the atmosphere had oxygen mainly close to the ground.
• D) Land animals of that period consumed erect plants.
• E) Land animals of that period were small, so they needed short plants to eat.

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