This is related to race ~ biology may not be difficult to understand if you have studied it ~ there are regional differences ~ take humans as an example. After a long evolution, today's human beings ~ Don't you find that foreigners' muscles are generally better than those of Asians ~ Japanese sumo wrestlers, but China's, may not be up to standard ~ Westerners are generally taller ~ There are also whites, yellow people, blacks and foreigners who are better than China people.

Take personal physique as an example, some people are fat when drinking cold water ~ some people are not fat when eating dry food ~

Animals of the same species have different evolutionary degrees in different places. There is still a long way to go between the Northeast Tiger and the South China Tiger ~ Why are there white tigers and yellow tigers ~ Camels have two humps in some places and one hump in some places ~ Tropical fish and temperate fish are different, and they all evolved according to local conditions ~