Explain: one of the tallest dog breeds is the great dane, which stands over a meter tall. one of the shortest is the pomeranian, which stands about 20 centimeters tall. based on what you have learned about artificial selection, how were these two breeds developed?

To breed larger or smaller dogs, artificial selection allows the crossing of dogs of varying sizes, so that through the genetic combination of these dogs the offspring has a larger size or a smaller size.

Explanation:

Artificial selection is the process made by the human being, where living beings are crossed in a provoked way seeking to generate descendants with a specific, favorable and desirable characteristic for the human being. An example of this is the use of natural selection to raise dogs smaller or larger than normal.

To breed larger or smaller dogs, artificial selection allows the crossing of dogs of varying sizes, so that through the genetic combination of these dogs the offspring has a larger size or a smaller size. Thus, if it is desirable for the offspring to be smaller in size, dogs of reduced size should be crossed, while, if it is desirable to obtain offspring with the larger size, dogs of larger sizes should be crossed.

Explanation:

1. A)Plants absorb water from the soil by osmosis. Root hair cells are adapted for this by having a large surface area to speed up osmosis. The absorbed water is transported through the roots to the rest of the plant where it is used for different purposes. They have a large surface area, due to their hair-like projections, which eases uptake.

B) refer the picture

2. The end walls are removed from each end, forming an uninterrupted tube, so water can pass through easily.Their walls are thickened with a woody substance called lignin, which helps to support the xylem vessels and stops them collapsing inwards.There are small pits in the cell wall where is no lignin so water and ions can move into and out of the vessels.

3. They absorb mineral ions by active transport, against the concentration gradient. Root hair cells are adapted for taking up water and mineral ions by having a large surface area to increase the rate of absorption.

4. Plants absorb water through their entire surface – roots, stems and leaves because of this osmosis occurs and the water is absorbed by the root hairs through cell membranes from the soil. Then the root hair cells become more turgid and their osmotic pressure falls.