Explanation

• The ribcage, which consists of the ribs and sternum.
• It forms a protective cage around the thoracic cavity, shielding the vital organs within, including the heart and lungs.

Explanation

• Each bronchial tube (bronchus) is joined to each lung.
• The bronchi are airways that branch off from the trachea (windpipe) and enter the lungs, allowing air to pass through during breathing.

Explanation

Based on the examination findings provided, the presenting diameter of the fetus is likely the suboccipitofrontal diameter.

The suboccipitofrontal diameter refers to the diameter of the fetal head from the subocciput (the lowest point on the back of the head) to the center of the frontal bone.

In the occipitoanterior position, this diameter is the presenting diameter of the fetal head during labor.

Explanation

Surgery is the mainstay treatment for nasopharyngeal angiofibroma,

This tumor is a benign but locally aggressive vascular tumor that occurs predominantly in adolescent males.

Explanation

Determinants of disease encompass rate ratios and proportions.

While rate ratios and proportions are important measures to understand the  distribution of diseases within populations

Determinants of disease also include factors:

• such as the agent (the cause of the disease)
• the host (the individual affected by the disease)
• the environment (the surrounding conditions where the disease occurs). 
  

Explanation

• Dragonflies, like all insects, have an "open circulatory system", which means that they do not have a closed system of blood vessels like humans or other animals.
• Instead, they have a network of tiny tubes called tracheae that bring oxygen directly to their cells, and they do not need a circulatory system to transport gas.

Explanation

• Trilobites evolved in the Cambrian period, approximately 521 million years ago.
• Trilobites are a group of extinct marine arthropods that flourished throughout the lower Paleozoic era before declining during the Devonian period.

Explanation

All of the options listed can be transmitted via infectious droplets:

• Rubella (German measles) is an airborne disease spread through droplets when an infected person talks, coughs, or sneezes.
• Common cold is a viral infection spread through airborne droplets when an infected person talks, coughs, or sneezes.
• Influenza (flu) is also an airborne disease spread through droplets when an infected person talks, coughs, or sneezes.

Infectious droplets are a common mode of transmission for many respiratory pathogens, including viruses and bacteria.

So, none of the above options are incorrect, and the correct answer is indeed "None of the above".

Explanation

• Ribosomes are the site of protein synthesis and are present in all living cells, including bacteria.
• They are not specific to the bacterial cell and are not typically used as antigens for vaccine development or immune response.

Explanation

Surplus red blood cells, needed to meet an emergency, are mainly stored in the spleen.