Answer:
Due to different climatic condition.
Explanation:
Altitudinal zonation makes possible to grow many different types of crops because of different climatic condition of the region. Each and every plant has different climatic and environmental requirements due to which different plants can be grown on different places where environment is suitable. Some plants needs cool environment so they can be grown on high altitude while some needs warm temperature which can be grown on lower altitudes near the equator.
Answer:
Yes.
Explanation:
Yes, early Earth's atmosphere was formed from the poisonous mixture of helium and hydrogen gases. But with the passage of time when Earth's crust began to cool, the composition of the atmosphere changed and carbondioxide and water concentration in the atmosphere increases due to carbondioxide gas emission from the volcanoes and evaporation of water from water bodies present on the surface of earth.
In certain areas of Africa, the sickle cell mutation has a high frequency because it confers an adaptive advantage against malaria which is endemic to this region.
<h3>What is natural selection?</h3>
Natural selection is a mechanism that drives evolution in natural populations, which in case we are observing stabilizing selection because it acts to stabilize the frequency of different alleles.
In certain regions in the African continent, the sickle cell mutation exhibits a high frequency since it is able to confer resistance against malaria which is an endemic disease located in this region.
Therefore, with this data, we can see that stabilizing selection acts to increase the frequency of the sickle cell mutation, which is harmful in regions where malaria is not endemic but increased in certain parts of Africa due to the incidence of malaria, thereby being an adaptive trait for these geographic areas.
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Answer:
group A
Explanation:
An independent variable is a variable in a functional relation wherein the value is not affected by other variables. That is in contrast to a dependent variable that is influenced by other variables. independent variable science definition: the variable in a functional relation wherein the value is independent.
A sequence of biotic changes that regenerate or create an ecological community is known as ecological succession.
Ecological succession is the process of change in an ecological community's species composition over time. The time frame can span several decades or fewer (for instance, following a wildfire). The community grows through an increase in complexity from a small number of pioneering plants and animals to a stable or self-sustaining climax community.
Succession is a process that occurs after a disturbance or the early colonization of a new environment. It involves changes to an ecological community that are more or less predictable and orderly. Secondary succession refers to succession that occurs after a pre-existing community has been disrupted, whereas primary succession refers to succession that starts in new environments with no impact from pre-existing groups.
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