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pav-90 [236]
3 years ago
8

Prior to cell division, the DNA material in the original cell must be duplicated. Why is this important?

Biology
1 answer:
Amanda [17]3 years ago
3 0

DNA has to duplicate itself prior to cell division, so that the 2 daughter cells that will be created during cell division will have the same DNA identical to the parent cells. 
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PLEASE HELP- 20 points
Masja [62]

✯Hello✯

↪  Its HETEROTROPHIC

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❤Gianna❤

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What may have helped horses change over the last 40 million years? A) an increase in their height and weight B) the coming and g
melisa1 [442]

A change in their food, from trees to grass in the Great Plains.

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THE WORLD RESOURCES SIMULATION CENTER. ... The WRSC will provide global leaders from business, governments, education and NGOs a resource for cooperation and collaboration to make informed and sustainable choices for humanity as a whole in the shortest possible time.

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svlad2 [7]

Answer:

sun to plants, plants to animals, animals to waste I believe

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2 years ago
All of the following protect the skin and mucous membranes from infection except
leva [86]

The question is incomplete. Th ecomplete question is as following:

All of the following protect the skin and mucous membranes from infection EXCEPT  

A) multiple layers of cells.

B) tears.

C) saliva.

D) HCl.

E) the "ciliary escalator."

Answer: D) HCl.

Explanation:

  • The epidermis, the outer layer of the skin provides waterproofing and serves as a barrier to infection and other laers also sustain any type of injury.  
  • Tears wash out foreign bodies which enter the eye. In addition, tears contain a substance called lysozyme which has an antibacterial function and works to prevent microbial invasion and infection.  
  • Saliva protects against infection, especially via the innate immune system. This mechanism is an important first-line protection against bacterial and viral infection
  • The mucociliar escalator is within the conducting airways and is composed of mucus and cilia that transfer the mucus up and out of the lungs where it can be removed by coughing or swallowing,

Whereas HCL helps in the digestion process.

Hence, the correct option is D.

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3 years ago
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