These are antonyms!!
Resistant means that something can't affect it (the resistant object), or has a hard time affecting it. For example, water resistant shoes aren't easily affected by water; water cant pass through them as easily as non-water resistant shoes.
Yielding means that something is flexible or is influenced by another thing easily. For example, when you "yield" when driving, you are letting the other cars go before you; or, when an object "yields" to pressure, it is bending under pressure (though not quite breaking).
In summary: resistant means nothing can touch it, while yielding means that things easily affect it; thus, antonyms.
The closest word in definition to tenacious would be;
“Decisive”
(Decisive means “producing a definite result”)
Could you please add the excerpt?
A writer wants to use an active voice when t<span>he subject of the sentence performs the action expressed in the verb. like for the sentence:
</span><span>The boy hugged the dog.
</span>the bold words show the subject performing the action (the dog) and the individual being acted upon (the boy). This is an example of a sentence using the active voice.