Fruit anatomy forms the edible tissue around the seeds. In other fruits such as "Citrus" stone fruits ("Prunus") only some layers of the pericarp are eaten. In accessory fruits, other tissues develop into the edible portion of the fruit instead, for example the receptacle of the flower in strawberries. In fleshy fruits, the pericarp is typically made up of three distinct layers: the epicarp (also known as exocarp), which is the outermost layer; the mesocarp, which is the middle layer; and the endocarp, which is the inner layer surrounding the ovary or the seeds. In a citrus fruit, the epicarp and mesocarp
Earliest known life forms ocean, and at least high into the atmosphere. Under certain test conditions, life forms have been observed to thrive in the near-weightlessness of space and to survive in the vacuum of outer space. Life forms appear to thrive in the Mariana Trench, the deepest spot in the Earth's oceans, reaching a depth of . Other researchers reported related studies that life forms thrive inside rocks up to below the sea floor under of ocean, off the coast of the northwestern United States, as well as beneath the seabed off Japan. In August 2014, scientists confirmed the existence of life forms