Many cells in multicellular organisms are specialised. They have specific roles in the organism of which they are part. Their structure is adapted to their function. They are often grouped together ...

Green plants and algae use light energy to make glucose and oxygen from carbon dioxide and water. Temperature, carbon dioxide concentration and light intensity can affect the rate of photosynthesis.

Sameena Zahoor, MD, is board-certified in family medicine and works at the Hope Clinic, which provides free primary medical care to uninsured and under-insured patients, as a physician. The appendix ...