Stomata close when guard cells?

Ethiopia suffered a devastating famine during 1983–1985 due to drought, conflict, and economic problems. Millions were affected, and the crisis drew global humanitarian attention and international relief efforts.

Villi are tiny finger-like projections found in the small intestine. They increase the surface area for absorption of digested nutrients into the bloodstream, making digestion and nutrient uptake highly efficient.

A standard mechanical stopwatch is commonly designed to measure time intervals as small as one-tenth of a second (0.1 sec). Such precision is useful in laboratories, sports timing, and scientific experiments requiring accurate measurements.

A supernova occurs when a star explodes violently at the end of its life cycle. This massive explosion releases enormous energy and can briefly outshine entire galaxies while spreading heavy elements into space that later form planets and stars.

The Rio Earth Summit, officially called the United Nations Conference on Environment and Development (UNCED), was held in June 1992 in Rio de Janeiro, Brazil. It focused on sustainable development, environmental protection, and climate-related policies.