A) The majority of the effects of the asteroid impact happened locally in the Americas, but extinctions happened for months everywhere on the planet. Mostly, the impact killed off any animal that required lots of plants as food and any predator that ate those. Small animals survived because the food was scarce until around a year later, when the vegetation had grown again.
B) The effects were indeed minor in the other side of the world. The tuatara in New Zealand is essentially a non flying dinosaur that survived the impact perfectly fine.
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