If the inner lining of the air sacs neither thin nor highly vascularized, then it can be inferred that AIR SACS ARE CANNOT BE THE SITES OF GASEOUS EXCHANGE BETWEEN AIR AND BLOOD. Air sacs are generally lined with mucus and surrounded with blood capillaries.
In case of birds, air sacs play an important role in respiratory system.
The correct answer is carcinoma. Mammary duct ectasia, papilloma and fibroadenoma are benign conditions of the breast. <span>Breast carcinoma is malign cancer that develops from breast tissue. Breast cancer is the<span> most common cancer among women</span> which can be the result of genetic or lifestyle factors. Invasive ductal carcinoma (IDC) is the most common type of breast cancer<span>.</span></span>
One factor is resting and exercising
stress and peace
<span>When cells were first taken from Henrietta Lacks, she was suffering from cervix cancer. Henrietta Lacks was a woman whose cervix cancer cells were used as the source of the HeLa cell line nowadays used in medical research. During treatment for cervical cancer in 1951, the cells were taken without her knowledge. The cells were cultured by George Otto Gey who created the HeLa cell line.</span>
