Answer:
The condition in which an organism whose cells have either gained or lost a chromosome is called an <u>aneuploidy</u>.
It is hard to stop using., It is a nonrenewable resource., It is damaging to the environment.
With the advent of industrialization, several trees have been cut at an alarming rate for raw materials and various other purposes. This felling of trees can be regulated by selective cutting, clear-cutting and shelterwood cutting.
Forest fires are one of the common causes of loss of forests. Sometimes the forest land is set on fire to make the land available for commercial purposes. Once cleared, there can be no vegetation. Natural forest fires are also responsible for the destruction of huge forest covers. Latest fire fighting techniques should be adopted to conserve the forest. However, forest fires are an important part of the ecosystem and it helps replenish nutrients in the soil from dead and decaying matter.
More trees should be planted to increase the forest cover. Trees should be selected according to the geographical conditions of a particular region and proper care should be taken during the growth of trees.
Prevention of exploitation of forestry and forest products is necessary for the conservation of forest.
The existing forests should be protected from diseases by spraying chemicals, antibiotics or development of pest-resistant strains of trees.
Answer:
C. People at a football game.
The convergent evolution may cause the arising of the similar traits in distantly related species. These traits may arise due to the demands during the course of evolution, the reason for having a different origin may be that it was not required initially, but required later. The bones of the birds and the bat are homologous in structure, but the origin of the wings are different.
So, these characters represent a type of convergent evolution.
