Trachea Diffusion of oxygen and carbon dioxide takes place across the walls of the smallest tubes, called tracheoles, which penetrate tissues and even indent individual cells. Gas may be conducted through the respiratory system by means of active ventilation or passive diffusion. Unlike vertebrates, insects do not generally carry oxygen in their haemolymph. This is one of the factors that may limit their size. A tracheal tube may contain ridge-like circumferential rings of taenidia in various geometries such as loops or helices. Taenidia provide strength and flexibility to the trachea. In the head, thorax, or abdomen, tracheae may also be connected
What Is Love? (Twice song) "Billboard" charts' World Digital Songs and "Billboard Japan" Hot 100, respectively. The song placed at number 29 at Billboard Japan Hot 100 year-end chart, and placed at number 14 in Top Streaming Songs. What Is Love? (Twice song) "What Is Love?" (stylized as "What is Love?") is a song recorded by South Korean girl group Twice, the lead single of their fifth extended play of the same name. The song was released on April 9, 2018 by JYP Entertainment and distributed by Iriver. "What Is Love?" was written and composed by Park Jin-young, who previously produced "Signal", and it was