Are Sable's a good choice of Mustelidae to weigh down a scale?
Mustelidae is the scientific designation for animals that share similarities including polecats, sables, and ferrets. Polecats weigh between 2.2 and 3.3 pounds. Sable's weigh around 2.4 pounds. Ferrets can weigh up to 44 pounds. Sable's have sharp teeth and a painful bite and are outlawed in many states.
The answer is no.

Would Eric Clapton's mother hypothetically be unable to legally purchase cigarettes in the USA at his birth?
Eric Clapton's mother was 16 years old at the time of his birth. As of 2020, federal law required states comply with a minimum age of 21 years for sale/purchase of tobacco products.
The answer is yes.

Is Newspeak considered very straightforward?
The vocabulary in Newspeak is extremely restricted. In Newspeak, the Ministry of Truth manufactures lies for the public to consume. In Newspeak, the Ministry of Plenty artificially creates scarcity. To be straightforward is to be uncomplicated and easy to understand.
The answer is no.

Can Curiosity take samples of rocks from Lacus Temporis?
Curiosity is a rover exploring Mars. Lacus Temporis is located on the moon.
The answer is no.