A student put room-temperature water into a bottle. She pushed a stopper and tube into the bottle until the water came halfway up the tube.
The student turned the bottle system sideways and put a cold wrap
around the bottle for 2 minutes. She then put a hot wrap around the
bottle. What caused the the water level in the tube to change when the
student put the hot wrap on the bottle?

d. stage 4

explanation:

the existence of some kind of demographic transition is widely accepted in the social sciences because of the well-established historical correlation linking dropping fertility to social and economic development.[1] scholars debate whether industrialization and higher incomes lead to lower population, or whether lower populations lead to industrialization and higher incomes. scholars also debate to what extent various proposed and sometimes inter-related factors such as higher per capita income,lower mortality, old-age security, and rise of demand for human capital are involved.[2]

the only plants classified as non-seed producers are b) moss, fern, and liverwort!

hope this !

i think it's severe storms but i might be wrong