Please remember that science is under attack in the United States - new proposals would gut the nih even beyond the horror that is ongoing. As a scientist I am horrified and I truly hope that we don’t abandon the usas historically strong investment in the future.
The funding environment in Canada is quite simply abysmal. You don’t need a politician to kill your grant, the money doesn’t exist in the first place. Canada could do so incredibly well if it only would invest in science.
Heritability is the proportion of variance in a trait that can be ascribed to genetics. So if you increase or decrease the total variance in the population u change heritability by definition. Eg. Split the pop in half and give one half less food - that half will be smaller (eg shorter in humans) and variance will increase thus the heritability will necessarily decrease.