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40 years
no it does not remain contant.
Yes, Mass remains constant because the definition of mass does not mean weight. Mass means the amount of room and object takes.
They all have cross sections that remain constant when intersected by a plane perpendicular to their lengths.
The population will remain stable
either remain unchanged or keep a dynamic balance that remains constant.
It doesn't. This is known as "climate change".
It is a situation where allele frequencies remain constant.
Equal fitness in a population
The overall growth rate of the general population is stagnant .
40 years
The number of births has to equal the number of deaths for zero population growth (ZPG). This is assuming there are no immigrations/emigrations into/out of the population.
No but if you replace a constant with a function it will remain a formula
Static variables (should) remain the same e.g. temperature of a water bath, k constant of a particular spring. Dynamic variables change as the experiment progresses e.g. air temperature and pressure, amount of natural light.
The concentration of reactants and products remain constant.
pressure did not remain constant or if the amount of gas did not remain constant.
Composition would remain constant.