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In addition to seeds, which of the following characteristics are unique to the seed-producing plants? a) sporopollenin b) lignin present in cell walls c) pollen d) use of air currents as a dispersal agent e) megaphylls

The cluster of developing cells from conception until birth is called an

About how many years does it take for one cycle of surface water to become deep water and then surface water again in the oceans? 101001,000