From the trachea, air enters the, which branch out into smaller tubes called.

The correct answer is air enters the - Bronchi and smaller tubes called- Bronchioles.

Explanation:

In humans, the respiratory system includes specialized organs like nose,  the pharynx (or throat), oral cavity, larynx, the trachea, the stem bronchi.

The process of respiration starts with inhaling the air through nose and mouth which travels down to the back of your throat and windpipe called trachea. The trachea then divides into air passage tubes called bronchi which ramify within the and is known as the bronchioles.

Thus, Bronchi and bronchioles are the correct answer.

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link:

correct answer: understand the different control methods available

integrated pest management is an strategy that is based on the ecosystem and try to prevent the pest and the damage caused by them by applying combination of technique like habitat manipulation, biological control and use of resistant varieties.

the main aim of the integrated pest management is not to completely eliminate the pest but to strengthen the ecosystem so that conditions are favorable for plants and unfavorable for pests.