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Annette [7]
3 years ago
8

First invertebrates to develop a true nervous system​

Biology
1 answer:
Tasya [4]3 years ago
8 0

Answer:

Coelenterates are the first invertebrates to develop a true nervous system.

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What would happen if you did not have the stapedius and tensor tympani muscles? A. The ear canal would stay permanently closed.
almond37 [142]
<h2>(D) is the correct option </h2>

Explanation:

  • Both the stapedius and tensor tympani are striated muscles
  • The stapedius is about 6 mm in length, arises from the pyramidal process and the tendon attaches to the posterior neck of the stapes
  • The stapedius is a muscle with a high oxidative capacity
  • The tensor tympani is about 25 mm in length, the muscle is not as strong as the stapedius, and the tendon also contains more elastic tissue and fat
  • The tensor tympani courses through a bony canal in the wall of the anterior middle ear, and attaches to the neck of the manubrium
  • The tensor tympani and stapedius muscles are protective reflexes
  • They reduce the amount of sound that gets into the inner ear
  • They are somewhat similar to the blink reflex thus they can be triggered by loud noise, and when they go off, both ears can be involved
  • If stapedius and tensor tympani muscles is not present then loud sounds would cause the ossicles to move too much, potentially causing damage to the inner ear  
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3 years ago
Which is the end result of cytokinesis?
pochemuha
The end result of cytokinesis is another cell cycle because it already is the final stage of a cell cycle.
7 0
3 years ago
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Which best exemplifies the concept of neuroplasticity?
KonstantinChe [14]
The correct answer is "the formation of new brain cell connections as the result of reading a book".

Usually, neuroplasticity is apparent in young children when the central nervous system has an abundance of neurons. This is always in the context of forming new brain cell connections or synapses that will lead the person to access the information quicker. This also exemplifies the principle of use and disuse when it comes to knowledge. 

The other choices concerns the skeletal system, cardiovascular system, and the endocrine/reproductive system; all of which do not have a relation with neuroplasticity.
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<span>Marsupials are any members of the mammalian class Marsupialia and are endemic to Australasia and the Americas. The main characteristic common to these species is that most of the young are carried in a pouch because they give birth to relatively undeveloped young. Examples of marsupials include kangaroos, wallabies, koalas, possums, opossums, wombats, and Tasmanian devils. </span>
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Which types of mutation are possible thanks to the redundant nature of the genetic code?
krok68 [10]

Cancer is a type of harmful mutation.

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