There are many species that might go extinct. The one most endangered: White rhinos, with less than 100 in their population. To help these animals, people fund programs like the WildLife foundation. Today, with technology, we haven't had the time to make a change, these people work hard to make sure these animals get proper care and love. :)
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Answer:
the change in absorbance reflects the reaction rate. As the reaction completes, its rate slows, so the absorbance levels off.
Explanation:
A spectrophotometer measures the amount of light of a particular color passing through the sample. The changing color of the dye will change the value read by the spectrophotometer..
Apparently, the absorbance increased as the reaction progressed. When the reaction was almost complete, the absorbance increase slowed or stopped.
Answer:
A) Elastin
Explanation:
Elastin is the principle load-bearing protien present in the wall of aorta. It is the protien which coil and recoils like a spring within the elastic fibres and accounts for elasticity of blood vessels. As during excerise , afterload is increased ,thus a stretch is produced in the vessels. Similarly im warm environment the vessels dilate this this stretch is produced by elastin.
64% of the infected person have survived after being infected by the middle east respiratory syndrome.
<h3>How middle east respiratory
syndrome is caused?</h3>
Middle east respiratory syndrome is a viral respiratory disease caused by a novel coronavirus (MERS-CoV).
The fatality rate of this severe disease is 36%, which means this many of patients died due to the infection caused by a novel coronavirus. It was the time of 2012 to 2017. It was first found in Saudi Arabia in 2012.
Therefore, 64% of the infected person have survived after being infected by the middle east respiratory syndrome.
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T-cells functions in cell-mediated immunity while b-cell functions in humoral immunity .
Hence Option A is correct.
What is cell-mediated immunity?
cell-mediated immunity is an immune response that does not involves antibodies .in this immunity , the specialised T-lymphocytes circulate in blood and tissue and directly attacks antigens .these cells either attack directly the antigens or produce clone of cells which respond to antigens .killer T-cells destroys pathogens and provides cell-mediated immunity. it destroys pathogens cells by secreting lysozymes. it shows its activity at the location of antigen presenting tissue. it has slow response.
What is humoral immunity?
humoral immunity is a type of immunity that mediated by macromolecules including secreted antibodies ,complement proteins ,and certain antimicrobial peptides.in this type the B-lymphocyte produce antibodies in blood and lymph ( known as humors). it protects the body against the invasion of bacteria and viruses into the body by antigen-antibody reactions. antigen specific plasma B-cells provide antibody mediated immunity .it normally causes agglutination and neutralization of foreign antigens. it shows its activity in extracellular fluids. it has fast response upon detection.
T-cells :
It is a part of white blood cell. it is apart of immune system and develop from stem cells in the bone marrow .they help in protection of body from infections and may help fight cancer.it is also called as T-lymphocyte.
B-cells:
It is a type of white blood cell that makes antibodies. B-cells are part of the immune system and develop from stem cells in bone marrow .it is also called as B-lymphocyte.
Hence OPTION A is correct.
Learn more about B-cells and T-cells here
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