A population of 2000 seals produces 950 young in one year. In the same period of time, 150 seals die. If 50 seals leave the population, and 30 seals join the population, what is the overall population change of this seal population?

Amale bird-of-paradise uses a dance to attract mates in which it flaps its tail feathers on the ground and jumps around a potential female mate. a different male bird-of-paradise does a similar dance but it jumps around the female in the opposite direction. the female bird is only attracted to one style of dance, in one direction.