Answer: The ultimate goal of the peer review process is that you can have others review and look over your work for things that are incorrect, need fixing, or need rewording. When we write things on our own, we sometimes make unconscious errors that we sometimes do not even catch in revision. Having a new set of eyes look at something helps to catch errors that we might miss. It is very similar to reading your work out load to catch errors, as reading something out loud is another effective strategy when reviewing your work.
During exercise there is an increase in physical activity and muscle cells respire more than they do when the body is at rest. The heart rate increases during exercise. The rate and depth of breathing increases - this makes sure that more oxygen is absorbed into the blood, and more carbon dioxide is removed from it.
Answer:
They have helical thickening of lignin in their walls to prevent collapse
Explanation:
the primary function of Xylem and its conducting vessels tracheids is to provide support and tranport water and minerals in plants.
Xylem vessels have layers of dead materials in the walls called LIGNIN. Lignin is a polymer; a very strong, hard materials that stop water passage through it,because it contains dead cells,
Therefore the presence of deposit of these strong impermeable, ligified walls in its walls prevent its collapse during mass flow of water of transpiration pull.
