Gaseous atoms and plasmic ions expand in all directions.
It's called the fruiting body.
Mountain chains match up where South America collided with Australia to form Pangaea.
Vaccination - artificial active immunity when the body is exposed to weakened pathogen in order to stimulate a primary immune response.
The correct option is this: PLANTS NATURALLY GROW TOWARD A SOURCE OF LIGHT.
Darwin carried out an experiment in which he found that when the tip of a plant is covered with an opaque material, the plant grow up straight but when it is covered with a transparent material that allow light, the plant bend toward the source of light. He thus, concluded that the tip of the plant is responsible for sensing light which is needed for photosynthesis.
