Either adenine and guanine or thymine and cytosine. It is either because the first adenine pairs with thymine and guanine pairs with cytosine, So each rung will have one of the two pairs.
We can tell the age of a yeast cell by counting scars or bud scars.
As a mother cell of yeast goes through successive rounds of cell division, the Bud scars remain permanently deposited on the surface of the mother cell. The budding of each daughter cell leaves a ring-shaped deposit which is called a bud scar which deposits on the cell wall of the mother cell.
Therefore, if the mother cell divides, it will leave bud scars. Again if the daughter cell divides, then again, it will leave bud scars. So, counting these ring-shaped deposits or bud scars will give the number of successive cell divisions and the age of yeast cells.
Learn more about budding here
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Answer;
A. shape, elevation, and steepness of features
Explanation;
-A topographic map is a detailed and accurate two-dimensional representation of natural and human-made features on the Earth's surface. These maps are used for a number of applications, from camping, hunting, fishing, and hiking to urban planning, resource management, and surveying.
-These map show the three-dimensional shape of the land. Most topographic maps make use of contour lines to depict elevations above sea level. The contour lines reveal the shape of the land in the vertical direction, allowing the 3-dimensional shape of the land to be portrayed on a 2-dimensional map. Contour lines are drawn on a topographic map to show the location of hills, mountains and valleys.