<span>Mutagens are chemical or physical factors that increase the rate of mutation.</span>
Gram positive bacteria have cell walls composed of thick layers of peptidoglycan.
Should be Polygenic inheritance... which is a type of incomplete dominance
What you've described is called Plasticity
Also known as neuroplasticity or neural plasticity, it is a term used for the brain's ability to change itself and mold, like plastic, even in adulthood and when fully developed. This occurs for various reasons, not only due to physical damage.
Answer:
Estimates of historical world population
Year 1400 1600
population (in billions) 0.35–0.40 0.50–0.58
growth p.a. >0% 0.15–0.3%
