The cell enters the first phase of mitosis: prophase. The replicated chromosomes condense into shapes that resemble the letter X. The membrane around the nucleus starts to break down. Special structures called spindle fibers form
From there, the cell enters metaphase—the second phase of mitosis. Each chromosome attaches to a spindle fiber at its centromere (the middle of the chromosome). Chromosomes line up at the center of the cell. The next step is anaphase.
The last step is when the cell enters the last phase of mitosis—telophase. The chromosomes begin to uncoil and form chromatin. The spindle breaks down, and two new nuclei form. The cell membrane begins to close in, starting to split the cell into two.
A. Earth's magnetic field reverses over time; the changes show that seafloor spreading has taken place over time.
Explanation:
The pattern of the magnetic minerals in seafloor ridges are aligned in a repeating pattern because the earth's magnetic field reverses overtime.
This provides evidence because the changes shows that the sea floor spreading has taken place over time.
- The concept of sea floor spreading was first suggested by Harry Hess in the early 1960's.
- Using sophisticated tools, he was able to discover stripe patterns of magnetic minerals in rocks.
- The earth can be likened to a giant bar magnet
- The geomagnetic field originates from the core where the movement of molten metals induces magnetism.
- In a fresh cooling magma, the metallic minerals are able to align their domains with the prevailing magnetic field.
- At some point the magnetic field is normal with a very strong intensity. At other times the intensity is low and it reverses.
- The minerals keeps track of the changes.
- This leads to striped pattern that has been used to suggest sea floor spreading.
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Answer:
centimeters
Explanation:
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