It is useful for the walls of capillaries to consist of a single layer of thin, flattened cells in order to easily diffuse oxygen and nutrients easily from the blood and into the capillaries. Not only that, but this also makes it more efficient for carbon dioxide and other waste molecules to diffuse from the capillaries and into the blood. If capillaries were thicker than a cell, then it would be more difficult for materials to diffuse through the thick layer of cells.
Answer:
Senescence
Explanation:
Chlorophyll degrades during leaf senescence causing the change of colour in autumn leaves.
Answer is: active transport.
In active transport<span> because energy is required to move the sodium and potassium ions against the concentration gradient. There is two type of active transport:
1) </span>Primary active transport directly
uses metabolic energy (adenosine triphosphate- ATP) to transport molecules
across a membrane.
2) In secondary active transport (coupled
transport) there is no direct coupling of ATP, energy derived from
the pumping of protons across a cell membrane.
https://youtu.be/ub82Xb1C8os
this will help
The appearance of a pink or blue color in a thioglycolate tube means that oxygen is present in that part of the tube. The different colors depend on which dye has been added. Pink color comes from resazurine, and blue is from methylene blue.
