The 3 types of scientific investigation are correlative,comparative, and descriptive
The reassessment of the patient is usually completed: in the ER
I'm no Eisten, but from what I remember when I was in middle school. The Earth's rotation axis affect Earth's weather for seasons. The seasons change (weather) depending on the amount of sunlight as earth revolves around the sun.
Well, depending on how long the migration is, many of the animals (mainly birds) could get sick and die, lowering the population. They could be shot by hunters, lowering the population. The children of the population could get left behind and lose their way, lowering the population. I'm not entirely sure how the population could grow other than them finding and staying with another group of their own kind. hope I was helpful! :)
The correct answer would be through adaptation and eventually over time they had to evolve to the area around them which made them develop over time to have longer necks .