Which new fact would strengthen or weaken the argument — science and technology passages

CAT has tested this idea 10 times across 9 papers, from 2018 to 2025. Solve one, and the others are the same method with different numbers or wording, which is why repeated concepts are the most efficient thing to practise.

Question	What it asks	Answer
CAT 2018 Slot 1 · VARC Q24	epigenetics; which finding would negate the passage's main message	C
CAT 2020 Slot 1 · VARC Q6	dialects in northern elephant seal calls; which condition would have preserved dialects	D
CAT 2021 Slot 1 · VARC Q14	cuttlefish marshmallow test; which new fact would best complement the findings	B
CAT 2021 Slot 3 · VARC Q15	soft nano-robots; which scenario, if false, would support the passage	A
CAT 2023 Slot 1 · VARC Q16	wolves in lozere; which new fact would weaken the author's claims	A
CAT 2023 Slot 2 · VARC Q1	fast fashion and oxfam's second hand september; what would undermine the central idea	C
CAT 2024 Slot 2 · VARC Q20	drivers of carnivore attacks; the statement whose falsity would clash with the passage	A
CAT 2025 Slot 1 · VARC Q2	complex systems; assumption needed for the contact-tracing-app claim to hold	A
CAT 2025 Slot 1 · VARC Q4	complex systems; observation that most strengthens the second-order tail-event claim	B
CAT 2025 Slot 2 · VARC Q9	cavefish fat and carotenoids; cross result that would invalidate riddle's inference	A

Part of RC · Science & Technology (138 questions since 2017).