World War 2 occurred in the late 40's, so this is most likely why there is a dip in that age group.
Answer:
The two most important climatic factors for ecosystems are sunlight and water. Sunlight is necessary for plants to grow, and to provide energy to warm the earth's atmosphere. Light intensity controls plant growth. Light duration affects plant flowering and animal/insect habits.
Explanation:
Plants have these because root nodules<span> are formed when nitrogen fixing bacteria called "rhizobia" start to enter the cells of a host </span>plant<span>. Rhizobia normally live inside of the soil and they </span>can<span> exist without a host </span>plant<span>.</span>
Bem, existem centenas de idiomas e se você quiser Para ser exato, existem 7.139 idiomas falados todos os dias. Apenas 23 deles são mais falados que os outros.
