No. Its the same as blood. You can give a pint and not be "hurt". You make more, so does the tree.
Your elm tree could be producing sap because it was mixed with a maple tree. I know that our elm tree produces sap on a regular basis but my research has shown that it's a mix with a maple tree.
The sap usually runs in spring, when the weather is above freezing. Check the outside of the tree for wounds, there might be sap running out of it naturally. Tap the tree with a spigot if you want to check for sure.
no
Well if you fall from the tree or scrape yourself on the tree than yes or if the tree falls on you than yes that would hurt. But if you and the tree do not make contact than there is no way of getting hurt.
Tree's cannot feel " pain " or " hurt " but it would technically damage and possibly kill the tree due to water lose.
dig a deep trenches
Sapping means to dig a deep trenches in the ground and tunneling is a way in which data is transferred between two networks securely. CoUrTnEy
no
yes
Reducing the temperature of a heat-wave.
for life
Your question isn't very clear; however, something Morale-sapping would be something that took the morale or "willingness" right out of you. For example: finding out that they were closing your business and you would shortly be out of a job would lower the morale of most all employees; therefore, it would be an example of a morale-sapping scenario.