B) Nitrogen cycle
C) Potassium cycle
D) Phosphorus cycle
E) Water cycle
Answer:
Mitosis produces genetically identical diploid cells, while meiosis produces genetically different haploid cells.
Explanation:
Mitosis is a method of cell division by which one divides into two identical daughter cells. The chromosome number does not change after division. If mitosis occurs in diploid cell, the resultant daughter cells would be diploid and genetically identical. In meiosis, the cell divides into four daughter cells and chromosome in them is reduced to half. Thus, after meiosis diploid cell divides into haploid cells. These haploid cells are genetically different due to the exchange of chromosome segments between non-sister chromatids of a homologous chromosomes (crossing over).
Answer:
the answer is B
Mitosis produces genetically identical diploid cells, while meiosis produces genetically different haploid cells.
The correct answer is:
c. tool-making was a defining characteristic of humans
Explanation:
They believed that the tool making was a characteristic that was possessed by humans.The initial stone toolmaking increased by at least 2.6 million years ago. The Early Stone Age covers the most basic stone toolkits made by early humans. The Early Stone Age in Africa is comparable to what is described the Lower Paleolithic in Europe and Asia.
The structure of an organism or its part, directly influences its function, which is central to biological adaptation. Adaptation involves developing physical characteristics, which aid survival in specific environments. While analogous structures represent adaptation to similar environments, homologous structures indicate shared ancestry.
Structure and function are fundamentally related to adaptation in biology. Essentially, the shape or structure of an organism, or any of its body parts, directly relates to that part's function or purpose. This idea, called the structure-function relationship, is central to the concept of adaptation—the process by which organisms evolve physical characteristics that help them survive in their environment.
For example, consider the fins of whales and the wings of bats. Even though these animals differ significantly in many aspects, they both developed structures (fins and wings) that perform similar functions (swimming and flying), which are best suited to their specific environment. These analogous structures represent an adaptation to a common environmental condition, despite the lack of a close evolutionary relationship, and is known as convergent evolution.
On the other hand, homologous structures represent a shared ancestry. For instance, the grasping hands of humans and chimpanzees, which serve the same function, indicate a common ancestor. Despite their structural similarities, the ways these structures are used could vary, showcasing how different environmental conditions can drive variations in function and contribute to evolutionary divergence.
A prime example of the structure-function relationship—the hallmark of adaptation—is observed in the various beak shapes of finches. Different shapes serve different purposes or functions, permitting birds to make the best use of available food resources in their respective habitats.
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Answer:
liquid, with an average density of approximately 11 g/cm3
Explanation:
The outer core of the Earth is inferred to be a liquid layer composed of iron, nickel, and sulfur, compressed to a high density. It's responsible for generating Earth's magnetic field due to the circulation of the liquid metal inside. Notably, its diameter makes it larger than the planet Mercury.
The outer core of Earth is inferred to be a dense, metallic layer, over 2900 kilometers beneath the Earth's surface. It's chiefly composed of iron, nickel, and sulfur, compressed to a very high density. Quite fascinatingly, the outer core, unlike the solid inner core, is liquid.
This liquid state facilitates the circulation of metallic elements within it, helping generate Earth's magnetic field. As the liquid metal inside Earth moves, it sets up a circulating electric current, which subsequently produces a magnetic field.
For size perspective, it's worth noting that with a diameter of approximately 7000 kilometers, Earth's core is larger than the planet Mercury. This fascinating core, and particularly its outer liquid layer, provides key insights into understanding not only earth's geodynamic movements but also the formation of its protective magnetosphere.
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