The first class lever is the most common lever in the human body. True/False
Answer:
False
Explanation:
In first-class levers, the position of the fulcrum is between the effort and the load. In these levers such as scissors, if the effort (child) is farther from the fulcrum than the load, a heavy load can be moved. There are few first-class levers in the human body.
One of the examples of such a lever is the head resting on the vertebral column. When the head is raised, the contraction of the posterior neck muscles provides the effort and the fulcrum is formed by the joint between the atlas and the occipital bone. Third class levers are the most common types present in the human body.
Many human cells divide a finite number of times before going into permanent arrest, a phenomenon called Hayflick’s Phenomenon, which appears to be caused by the loss of telomeres.
Hayflick limit or Hayflick’s phenomena is defined as the number of times a normal cell population divides before entering the senescence phase.
Hayflick (1961) demonstrated that a population of normal human fetal cells divide in culture between 40 and 60 times before stopping.
This phenomenon is related to telomere length. Repeated mitosis leads to shortening of the telomeres on the DNA of the cell. Telomere shortening in humans eventually makes cell division impossible, and correlates with aging.
Telomeres are irrevocably shortened each time a cell divides. When the telomeres become too short, the cell can no longer divide.
Learn more about Hayflick's phenomenon here:
brainly.com/question/15002789
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Answer:
a
Explanation:
a just trust me on this one
4. Petroleum.
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Well they are both alive but the bacteria are actually creatures as in living,moving things but the fungi is a plant it is livibg but doesnt have a brain nor a mind to think or a heart. actually the bacteria doesnt have a brain but oh well idk