C: Photosphere ,corona ,chromosphere.
Wood tissue (witch in more detailed stans for shell, bone, and teeth)
The Van Allen belts are created by a planet's magnetic field. Therefore C. Earth's magnetosphere is the correct answer
LD50 is used to express TOXICITY OF TOXINS AND POISONS.
LD50 stands for Lethal Dose 50. This is the standard measure of the toxicity of a material, which will kill half of the sample population of a particular test animal in a defined time period, when they are exposed to the material.
It keeps the water in the plant, so it keeps the water from evaporating and killing the plant
