The oldest plant fossils indicate plants only had stems but no leaves, flowers, or roots.
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The statement above is TRUE.
The oldest known plant fossils are dated about 425 million years ago. The fossils resemble today's  liverworts; they have no leave, no flower, no seed and no roots. They only have horizontal stems which are connected to the soil by root hairs 

The speed of  sound:   sound travels  at different speeds depending on what it istraveling through. of the three mediums (gas, liquid, and solid)  sound waves travel the slowest through  gases, faster  through  liquids, and fastest  through  solids.