Answer:
c. It generates changes in the magnetic field of Earth.
Explanation:
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I got B. Because the answer is K2SO4, I got it right on my test so I know its right
Answer: The rate constant for the reaction is 
Explanation:
Expression for rate law for first order kinetics is given by:

where,
k = rate constant
t = age of sample = 559 min
a = let initial amount of the reactant = 
a - x = amount left after decay process = 



The rate constant for the reaction is 
Many elements show very strong similarities to each other.<span>For example, lithium (Li), sodium (Na), and potassium (K) are all soft, very reactive metals.
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It is to create energy that the cell can use. it takes in oxygen to break down food molecules to get cellular energy for cell function