<span>Difficult to determine the absolute age of the fossil, because radiometric dating of sedimentary rock is much, much more difficult than that of igneous rock. </span>
Answer:
The advantages of mixture a grasses and legumes is;
* extend the growing season of a pasture
* improve the quality of forage
* improve flexibility to survive environmental conditions
* reduce susceptibility to insects and disease attacks
* improve the palatability
* increase the organic matter content of the soil over time because of grass root system
* reduce weed encroachment
* reduce erosion
* produce higher yields
The probable pasture production for perennial ryegrass in the northern hemisphere leaves some time when the grass is dormant. There are times when other feed will be needed. Utilizing another grass or legume that flourishes during the less productive periods for perennial ryegrass extends the season for production and maintains the quality of feed.
