Answer:
A
Explanation:
Soil becomes less fertile the deeper it goes because the percentage of organic matter, such as humus and living organisms, decreases with depth. This reduction results in a lower nutrient content in the soil, lessening its fertility.
The soil gets less fertile the deeper it goes due to the increased distance from organic matter. The organic material of soil, called humus, is primarily found in the upper levels of the soil. It improves the soil structure and provides water and minerals to plants. As we go deeper into the soil, the quantity of this organic matter decreases which results in the soil being less fertile. The inorganic matter which primarily forms the deeper soil layers contributes less to fertility as it mainly consists of rock and lesser nutrients.
Besides, soil has different layers called horizons, each with distinct physical and chemical properties. These horizons include the A horizon which is a mixture of organic and inorganic products of weathering, and B horizon where there is an accumulation of mostly fine materials that have moved downward. The fertility of soil decreases as we move from the A horizon to the B horizon and further down.
Biological factors also play a significant role in the fertility of soil. The presence of living organisms greatly affects soil formation and structure. However, the number and impact of these organisms decrease with soil depth, also decreasing fertility.
#SPJ3
Answer:
Males use a protein to detect pheromones sent by females.
Protein work as a chemical signal for the mating.
Explanation:
Pheromones are secreted by the individual of the similar species and they provide signals for communication by releasing a protein substance, they are like alarm substances.
This protein helps to guide females and males so that reproduction can occur.
Females beetles released sex pheromones into the environment, which give a signal of their mating availability.
Then these pheromones are detected by receptors present on the male beetles, and in this way, they find the females for mating .
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Answer:
2
just did test
Explanation:
Answer:
The kind of evolutionary mechanism responsible for both snakes is B) Sympatric Evolution.
Explanation:
We need to study two species of snakes, the Emerald Tree Bow and the Boa Constrictor, they belong to the same genus. However, the former is tree-dwelling and needs high humidity whereas the latter is terrestrial and requires a dry environment.
To explain this phenomenon we present a similar example: Imagine that your family has lived in the same house for many years. After that, imagine that your sister moves out of that house and into a house in a nearby neighborhood. She begins a new family there and, through the years, her family continues to grow and live in this new house. When your family separated, you became different groups of people from the same common ancestor. Eventually, you might even evolve enough to feel that there are more differences between you than similarities. When this happens in nature, it's called sympatric speciation. This process allows new species to evolve from a common ancestor, while the new and old species are still living in the same geographic region.
This example is almost the same as both snakes. Sympatric Evolution was responsible for this phenomenon.
Finally, we can conclude that the kind of evolutionary mechanism responsible for both snakes is B) Sympatric Evolution.