Questions & Answers about Het konijn met de korte staart is heel tam.
How would I ask 'Which rabbit is very tame?' to practice this lesson's topic?
Since konijn is a neuter het-word, you would ask 'Welk konijn is heel tam?'. You drop the -e from welke for singular het-words. You use welk here rather than wat voor (een) because you are singling out a specific rabbit from a group, rather than asking about a general category.
What if I wanted to ask 'What kind of rabbit is very tame?' instead?
Then you would ask 'Wat voor een konijn is heel tam?'. You use wat voor (een) when asking about a breed, category, or type, rather than pointing out a specific individual animal in front of you.
Why does korte get an -e added to it, but tam stays exactly the same?
When an adjective comes directly in front of the noun it describes (like de korte staart), it almost always gets an -e at the end. But when the adjective comes later in the sentence after a verb (like is heel tam), it never gets an -e.
Can I use erg instead of heel to mean 'very' here?
Yes! You could say the rabbit is erg tam and it would mean exactly the same thing. Both heel and erg are very common ways to translate 'very' in Dutch.