Answer:
Option C, epiglottis
Explanation:
Epiglottis is a flap structure located at the larynx opening which is a separator between the upper and lower respiratory tract.
The upper part of the respiratory tract consists of Nostrils, Nasal Cavities, Pharynx, Epiglottis, and the Larynx.
After the Larynx, the upper respiratory tracts connects the trachea from where the lower respiratory tract starts. The lower respiratory tract consists of Trachea, Bronchi, Bronchioles, and the Lungs.
Hence, option C is the correct.
Answer:
<h2><em><u>12 cups</u></em></h2>
Explanation:
<em><u>Given</u></em><em><u>, </u></em>
No. of cups of water saved by 1 student = 3
<em><u>Therefore</u></em><em><u>, </u></em>
No. of cups of water saved by 4 students = 3 × 4
= <em><u>12 (Ans)</u></em>
An ecosystem<span> is a complete community of living organisms and the nonliving materials of their surroundings. Thus, its components include plants, animals, and microorganisms; soil, rocks, and minerals; as well as surrounding water sources and the local atmosphere. The size of </span>ecosystems<span> varies tremendously
hope it helps
</span>
It allows the scientist to determine the effect of the changed variable , it also allows samples and organisms to be tested under comfortable conditions