Question

1. which is a characteristic of all acute illnesses? they are life - threatening. they come on suddenly. they develop over years or even decades. they require professional medical care.

Explanation:

An acute illness is defined as one that has a sudden onset. Not all acute illnesses are life - threatening (e.g., a common cold can be acute but not life - threatening). Illnesses that develop over years or decades are chronic, not acute. Also, some minor acute illnesses (like a mild headache) may not require professional medical care.

Answer:

They come on suddenly.