Because the human race continues its unstoppable march across this planet - wiping out native animals habitats in favour of new housing estates, leisure parks, Golf courses etc !
what are the populations affected by humans???
Humans are animals. Gene differences distinguish us from other specie of animal, and there are many which contribute to our high sognitive processing skills.
Migration
No! because they are not humans and no populations.
Humans often change or destroy the habitats of animals and therefore could cause the numbers of certain animals to decrease. In extreme cases, this could eventually make an animal extinct.
The main threats to blackbuck's populations is inbreeding and humans. Humans are making their habitat not a good fit for living the blackbucks species.
Animal's contribute to welfare of mankind by providing them meat!! - If certain people in places where there is no suitable vegetation for to eat, Animal's eat that particular vegetation in cycle to which Human eats the animal and completes the food chain. Animal's contribute to medicines and ointments for human - The remains and parts of animals are being used in medicines for curing people There are many other ways by which animal's contribute to man's welfare which cannot be written. - Animals provide clothes and other accessories to humans. - Animals don't only provide meat they provide food such as milk... - Animals that are pets of humans provide distraction from stress and give sense of caring and also to become responsible.
There are several factors that contribute to plant extinction. Climate change, acid rain, animal extinction, deforestation, and declining honey bee populations all contribute to plant extinction.
polution
Humans often change or destroy the habitats of animals and therefore could cause the numbers of certain animals to decrease. In extreme cases, this could eventually make an animal extinct.
The humans are cutting down trees and forests relentlessly to make more place for human settlements and agriculture. This leads to the wild animals leaving their natural habitats as well as their food source. Not only this but the humans are also hunting and poaching the animals illegally for their skins and horns which are considered valuable. These activities paves the way for the decline of the animal population. Also due to the global warming and green house effect the polar ice caps are melting, forcing the animals to leave which also leads to the decline in animal population.
Hunting