Among U.S. President Donald Trump’s first actions after returning to office in January 2025 was imposing new tariffs on Canada, China, and Mexico, which he accused of sending fentanyl to the United ...

Respiration is the physiological process through which oxygen in the environment can be exchanged with carbon dioxide from an organism. This process requires specialized organs such as the lungs or ...

The endoplasmic reticulum (ER) is a compartment (organelle) in eukaryotic cells that consists of membrane sacs called cisternae. Because of the bound ribosomes, the 'rough' ER is the site of synthesis ...