BEST ANSWER WINS BRAINLIEST
When and where was the possibility of growing thornless varieties of plants discovered?

The discovery of thornless plants was made around the turn of the 20th century. to name one such thornless plant, particularly, the blackberry plant, the deviation from the  thorned blackberry canes were discovered in the united states. since then, several different thornless blackberry varieties have been cultivated for fruit gardens.

name and explain one of the event that occurs during meiosis that increases the variation in offspring even more than simple reproduction?

igneous rocks are formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.  

the composition depends on the source magma. there are almost a thousand types of composition found till now.  

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