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.
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.
No. Its the same as blood. You can give a pint and not be "hurt". You make more, so does the tree.
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
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.
Tiny bugs, worms, and little birds
the tree will shake
Its a tree thats all I know.
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exhausting, tiring, fatiguing, wearying, draining, sapping, weakening, enfeebling, debilitating, incapacitating, prostrating