in wet, moist dirt
There aren't many insects that eat garden worms. However, ants will eat garden worms that they find around the garden dead.
There are many invertebrates in the world but I would just specify the most common invertebrate worms, slugs, octopuses, spiders and ants.
They are useful because worms chew your food and turn it into garden fertilizer.
your soil would be bad earth worms help the soil
worms
garden or a rose garden
can earth worms be put directly in garden
Usually you will see them.
If by 'garden snake' you meant Garter Snake (Genus Thamnophis) - then yes. Worms are part of their natural diet.
The thick green and black striped worms in a flower garden are cut worms, also called horn worms. These do not harm people but can devastate a garden. They are known for eating tremendous amounts of vegetation overnight.
yes
they will be dead