ABC Question 1
What is known as the net movement of any type of molecule from a region of higher concentration to a region of lower concentration?
exocytosis
B
diffusion
C
endocytosis
D
Osmosis

stratosphere: as the altitude increases, the air temperature increases. the stratosphere has a layer of ozone, called the ozone layer. this layer absorbs most of the ultraviolet radiation from sunlight. this results in the stratosphere being warmer.

stress fractures occur largely in the feet and legs and are common in sports that require repetitive impact, primarily running/jumping sports such as gymnastics or track and field.