A. 1.5 g
Explanation:
The half-life is the time taken for a radioactive sample to decay to half of its initial composition.
At the half-time, an original sample would have decayed into half
Some materials have very fast half-life in the order of a few seconds and minutes. Some takes years.
The faster the half-life of a material, the more unstable it is.
Now to the problem,
Half- life of sample = 700 million years
Original mass of sample = 12g
Problem;
Mass of sample left after 2100 years = ?
Solving:
Time line using half life:
Start:
0yrs 700yrs 1400yrs 2100yrs
Sample:
mass 12g decays 6g decays 3g decays 1.5g
At the end of 2100yrs, we are going to have 1.5g sample of the uranium left.
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Answer: A
Explanation:
Both C4 and CAM have certain adaptations - like spatial or temporal differences that allow photosynthesis to occur in plants that live in very hot, dry environments where woter loss would be bad.
Answer:
Water soluble hormones bind to a cell surface localized receptor initiating a signaling cascade using intracellular second messengers for example epinephrine.
Hormone binding activates the G-protein and G-protein activates the adenylyl cylase and it catalyzed the conversion of ATP to cAMP which is second messenger in this pathway. cAMP activate the protein kinase and then protein kinase activate certain cytoplasmic protein which alter the activity of cell.