Why is a log easy to split lengthwise and difficult to split across?

If you cut along the fibers, then the cells are easily separated from each other (tracheids are tubes), and across – it is more difficult (there are no partitions in the tubes).

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.