The environment modifies.
Explanation:
A modification of the environment can lead to population changes overtime. The environment is very important for population dynamics.
It is predominantly made up of the factors that affects organisms and where they live.
If the resources in an environment gets depleted, organisms will be force to migrate from that place to another in search of more nutrient areas.
This and many other factor like climate, stability, etc causes changes to the population through time.
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Answer: The vapor pressure of the solution is 186.4 torr
Explanation:
As the relative lowering of vapor pressure is directly proportional to the amount of dissolved solute.
The formula for relative lowering of vapor pressure will be,

where,
= relative lowering in vapor pressure
i = Van'T Hoff factor = 1 (for non electrolytes)
= mole fraction of solute =
Given : 21.5 g of lactose is present in 200.0 g of water.
moles of solute (lactose) = 
moles of solvent (water) = 
Total moles = moles of solute (lactose) + moles of solvent (water) = 0.0628+ 11.1 = 11.1628
= mole fraction of solute =


Thus the vapor pressure of the solution is 186.4 torr
Natural, Organic & Manmade Fibers. after flame is out there is a soft gray ash!