Read the sentence.

members of law enforcement quickly learned how to spot suspicious behavior.

which of the following is the simple predicate?

members of law enforcement

learned

quickly learned how to spot

quickly

learned

In this sentence, the complete predicate is: quickly learned how to spot suspicious behavior, while the simple predicate is: learned. The simple predicate consists of the main verb or verb phrase in the predicate, without any modifiers, such as adverbs, that provide more information on the action. The simple predicate is the verb that describes what the subject of the sentence does.

the red coloration of the lungs looks alarming and adds to the overall message that the flu is threatening apex

explanation:

it refers to the definition of full-contact sports, where the condition is that the sport must have athletes must "purposely collide with each other