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lions [1.4K]
3 years ago
6

Neural crest cells appear on the edges of the neural tube and spread throughout the embryo, giving rise to all of the following

structures except __________.
A) sensory capsules in which eyes and other sense organs develop
B) pharyngeal slits (or clefts) of invertebrate chordates
C) some of the bones and cartilage of the skull
D) several types of neurons
E) teeth
Biology
1 answer:
Andre45 [30]3 years ago
5 0

Ans.

Neural crest cells are embryonic cells that are unique to organisms of phylum chordata. These cells give arise a number of cell lineage, such as bone and cartilage, melanocytes, smooth muscle, glia and neurons, eyes, teeth, and other sense organs. The neural crest cells do not form pharyngeal slits in invertebrate chordates.

Thus, the correct answer is option b).

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Solids will usually sink when placed in their own liquids. Which is an exception?
Marat540 [252]

WATER

Solids will usually sink when placed in their own liquids with the exception of water

Explanation:

Ice (the solid form of water) floats on water that is cooler than 4 degrees centigrade. This is unlike any other material and this phenomenon has been referred to as the ‘water anomaly’.

Most substances will sink in their own liquid because the solid form is denser than the amount of their own liquid that they displace when immersed. This is because the particles in the solid are closely packed together hence there are more particles per volume than in the liquid form.  

Water however, expands at temperatures below 4 degrees and hence ice is less dense than water at 4 degrees and below. The particles in ice are farther apart than particles of water at 4 degrees and below. There is, therefore, more particles per volume in the liquid form of water than in ice – making ice less dense.

Learn More:

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3 years ago
Carbon dioxide, Co2, contains carbon, yet it is considered to be inorganic. Explain.
scoray [572]
CO2 is considered organic because it doesn’t contain a hydrogen. Organic compounds must contain carbon bound to hydrogen and possibly other elements.
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3 years ago
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An investigator attempting to replicate Pasteur's swan-necked flask experiment has boiled a hay infusion for 1 hour. However, sh
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Answer:

Hay infusion refers to an amalgamation that can be formed by taking samples from different sources like rivers, lakes, ponds, and others. It is one of the best procedures that can elevate the density of the bacteria cell at any specific time interval.  

In the given case, even after boiling hay infusion for one hour, growth was observed in the flask after one day. It can be due to certain factors like the hay infusion may have been comprising some endospore, which is resistant to heat or may comprise some kinds of bacteria that can withstand high temperatures.  

Because of which, even after heating the infusion for one hour, it did not get influenced by the heat and got the chance to grow when it got optimum temperature again at the time when the sample was left as such.

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In the water cycle, water vapor evaporates into the atmosphere and forms clouds through condensation. What happens in the atmosp
xxTIMURxx [149]
I can say for certain that it's really probably not A. or D.

As for B. or C., I'd say C. 

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3 years ago
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3. a recently developed test for detecting fetal duchenne's muscular dystrophy is ________.
yuradex [85]

Amniocentesis is a freshly established test for identifying fetal duchenne's muscular dystrophy.

<h3>What is tested for during an amniocentesis?</h3>

Amniocentesis is a test that may be recommended to you during pregnancy to determine whether your unborn child has a chromosomal or genetic disorder like Down syndrome, Edwards syndrome, or Patau's syndrome.

<h3>What exactly does an amniocentesis entail?</h3>

A little sample of amniotic fluid is removed during an amniocentesis operation for testing. This is the fluid that a pregnant woman's fetus is enclosed in. The amniotic fluid shields the fetus from harm and is transparent and pale yellow in color. provides infection protection.

<h3>What takes place after a positive amniocentesis test?</h3>

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