there are many reasons a population or organisms would increase or decrease. some reasons are diseases, predator increase/decrease, good/bad weather, and enough/not enough resource's. :) yep
Immigration, decrease in infant mortality, increase in birth rate, decrease in mortality.
Some possible reasons are:bad weatherdiseasetoo many predatorsinvasive species
Index fossils work similar to counting populations of living creatures. An increase or decrease in populations of certain creatures can provide clues to the climate and climate changes.
There could be many reasons why. Their predators could have decreased, or the food that they have increases.
A person who studies reasons for rising and falling populations is a Demographer
Death and migration are factors that can decrease hare population.
The activity of amylase decreases drastcially due to the very low pH this is one of the reasons more amylase is added by the pacreas.
Populations are limited in their spatial distribution for a couple of reasons. One of these reasons is that there just isn't enough resources to do it any other way.
Native American populations decreased with the increase of colonial settlements. There are two main reasons for this. First, the Colonists violently attacked the Native Americans, especially the Powhatan Tribes in Virginia and the Wampanoag in Massachusetts. Second, the Colonists brought a number of diseases with them from the Old World that caused epidemics in the Native American populations, especially smallpox.
Typical reasons include an increase in the company's earnings, or in the value of its holdings, or its percentage of market share for its products. Stock price increases when there is a demand for the stock (buying) and will usually decrease if there is less demand (net selling).
Typical reasons include an increase in the company's earnings, or in the value of its holdings, or its percentage of market share for its products. Stock price increases when there is a demand for the stock (buying) and will usually decrease if there is less demand (net selling).
The are very few reasons why a person might need forehead surgery unless it was to correct a congenital malformation of the skull. However an individual may wish to have forehead surgery for cosmetic reasons in order to increase or decrease the hairline.