Answer:
The addition of an extra chromosome usually occurs spontaneously during conception. The cause of this is unknown and prevention is not possible. The most important risk factor for trisomy conditions is maternal age. Women in their late 30s and 40s have a higher chance of trisomy conditions occurring.
The tropical rain forest receives between 69 and 79 inches of precipitation per year.
Climate is of a region is classified based on observed weather pattern over many years (over 30 or 35 years).
Explanation:
For it to have been discerned that the tropical rain forest receives between 69 and 79 inches of precipitation per year, data from many years must have been collected to get the average figure.
The rest of the parameters are deducted from data within a very short time. These are weather parameters.
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For differences between weather and climate check out;
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The four main macromolecules are carbohydrates, lipids, proteins, and nucleic acids. Carbohydrates typically are used for energy production within the body, lipids are used for energy storage, proteins are typically used for structural support in things like your hair or nails, and nucleic acids are used for storing genetic material.
Over-grazing has led to erosion in the grasslands