Sentence 1: The things to listen and look out for could be any one, or perhaps several, of the the alarm bark of the deer, a noisy screech from the monkeys, and the most telling sign of all vultures waiting for the tiger to abandon the leftovers of what he caught for lunch.

Sentence 2: There is more than one signal to look for to know about a tiger's hunting success.
Is this second sentence entailed by the first?

Answer: yes

Sentence 1: Italy joins Nazi Germany in World War II

Sentence 2: Italy was an Axis power.
Is this second sentence entailed by the first?

Answer: yes

Sentence 1: These trends present a range of challenges that have no boundaries.

Sentence 2: The challenges have been set to a limit.
Is this second sentence entailed by the first?

Answer:
no