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Q: What is the "a" horizon commonly known as? Read this paragraph and choose the correct option from the provided answers: The first horizon is the "A" horizon. It is more commonly called the topsoil . The topsoil is usually the darkest layer of the soil. It is the layer with the most organic material. Humus forms from all the plant and animal debris that falls to or grows on the ground. The topsoil is also the region with the most biological activity. Many organisms live within this layer. Plant roots stretch down into this layer. The roots help to hold the topsoil in place. Topsoil is needed to grow most crops ( Figure below ). Choices: - sediment - core - crust - topsoil A:
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topsoil

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Q: What is the strength of an earthquake called? Read this paragraph and choose the correct option from the provided answers: Earthquake: What Does Magnitude Mean? at http://www. livescience. com/20538-earthquake-magnitude-video. html (2:00). Choices: - power - waves - force - magnitude A:
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magnitude

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Q: What do we call the orderly sequence of events in the life of a cell from the division of a single parent cell to produce two new daughter cells, to the subsequent division of those daughter cells? Read this paragraph and choose the correct option from the provided answers: 6.1 | The Genome By the end of this section, you will be able to: Describe the prokaryotic and eukaryotic genome Distinguish between chromosomes, genes, and traits The continuity of life from one cell to another has its foundation in the reproduction of cells by way of the cell cycle. The cell cycle is an orderly sequence of events in the life of a cell from the division of a single parent cell to produce two new daughter cells, to the subsequent division of those daughter cells. The mechanisms involved in the cell cycle are highly conserved across eukaryotes. Organisms as diverse as protists, plants, and animals employ similar steps. Choices: - cell death - cell replication - circadian cycle - cell cycle A:
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cell cycle