Answer: Option D.
Glue adjacent cells together.
Explanation:
The middle lamella of plant is the outermost layer of the matured plants cell wall and it is made up of calcium and magnesium pectates. It is the layer that glue to adjacent cells wall together. The primary walls that are glued together is the cellulose layer that is shedd by a growing and dividing cells. The pectins In plants form a layer between the adjacent cells.
Answer:
Low Stationary or Low Fluctuating
Reasons:
-birth rate is low
-death rate has fallen
-total population is high and stationary
-life expectancy is very high
1- They live in extreme environmental condition
Answer:
The leukocyte, commonly known as a white blood cell (or WBC), is a major component of the body’s defenses against disease. Leukocytes protect the body against invading microorganisms and body cells with mutated DNA, and they clean up debris. Platelets are essential for the repair of blood vessels when damage to them has occurred; they also provide growth factors for healing and repair.Although leukocytes and erythrocytes both originate from hematopoietic stem cells in the bone marrow, they are very different from each other in many significant ways. For instance, leukocytes are far less numerous than erythrocytes: Typically there are only 5000 to 10,000 per µL. They are also larger than erythrocytes and are the only formed elements that are complete cells, possessing a nucleus and organelles. And although there is just one type of erythrocyte, there are many types of leukocytes. Most of these types have a much shorter lifespan than that of erythrocytes, some as short as a few hours or even a few minutes in the case of acute infection.
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Explanation:
