A population is continually modified by increases (birth and immigration) and losses(death and emigration), and is limited by the effects of environmental factors such as disease.
A population is continually modified by increases (birth and immigration) and losses(death and emigration), and is limited by the effects of environmental factors such as disease.
一个种群始终处于不断的波动中，其原因是由于增长（出生和迁入）、降低（死亡和迁出）的改变，以及受环境因素如疾病的限制。