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Contact [7]
3 years ago
14

Bone cells that remove calcium from the blood to make bone are

Biology
1 answer:
Nina [5.8K]3 years ago
3 0
I do believe that would be the <span>parathyroid hormone </span>
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Explain the difficulties in developing antiviral drugs against dna viruses, when compared to rna viruses.
Juli2301 [7.4K]
The  DNA   virus  uses  nucleus  of  the  host  to  replicate it  genetic  material since  it  lack reverse  transcriptase enzyme.The similarities between  the  DNA virus  with human  protein it  make  difficult  to  treat  this  virus without  damaging  the  host cell.
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RNA  virus  has  reverse  transcriptase  enzyme which  is  used to  replicate  its  genetic material,  but  it  lack  ability  to check  errors,  which  led  to  higher mutation  rate.The  transcriptase  enzyme  is  used  to make vaccine  which  is  used  to treat  RNA  virus
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3 years ago
I need help !!
Ilya [14]
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3 years ago
Which is a characteristic of all vertebrates?
Bond [772]

The presence of vertebral column or notochord at any stage of life in any organism is the characteristic of vertebrate.

Explanation:

An animal is vertebrate if it fulfils the following criteria:

Presence of vertebral column or notochord.

Presence of endoskeleton or backbone.

The spinal cord runs above the vertebral column.

Humans embryo has notochord which becomes a vertebral column.

The alimentary canals end in the anus.

Mouth is present ta the anterior side of the vertebrate.

Have legs, fins or wings for movement.

Presence of a nervous system and sensory organs.

Presence of skin, lungs or gills.

Presence of a circulatory system.

Vertebrates include fish, amphibians, reptiles, birds and mammals.

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Which of the following statements is true?
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