New discoveries shed light on an ancient human species and its evolutionary links to modern humans. Stephen Chester, ...

Plant cells have several structures not found in other eukaryotes. In particular, organelles called chloroplasts allow plants to capture the energy of the Sun in energy-rich molecules; cell walls ...

Dec. 18, 2024 — Scientists have generated human stem cell models which contain notochord -- a tissue in the developing embryo that acts like a navigation system, directing cells where to build ...

Generally, the decisions made in one House have to be approved by the other. In this way the two-chamber system acts as a check and balance for both Houses. The Commons is publicly elected. The party ...

While these animals technically have an external skeleton made of chitin ... they possess one small, hard structure called a cuttlebone or gladius, which typically lies within the mantle. It is ...