Which feature is believed to have been the first step in the evolution of land plants from the green algae?
A. Evolution of flowers to attract pollinators
B. Evolution of vascular tissue
C. Evolution of microphylls
O D. Protection of the embryo

i believe it would cause an increase of percipitation, though i could be wrong. so i would say b is the answer.

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evidence and logical support is essential for a scientist to do in order to maintain credibility. this is because no one can believe without any logic and without any evidence.hence a scientist can maintain credibility by proving himself and by answering logically so experiments prove very beneficial. logical hypothesis give conclusion which is acceptable. therefore, there are two main factors to maintain credibility by a scientist is evidence and logical support.