<h3><u>Answer;</u></h3>
Potassium-40 has a half life of 1.25 billion years.
<h3><u>Explanation;</u></h3>
New amount = Original amount × (1/2)^n ; where n is the number of half lives.
Original amount is 50 atoms
New amount is 25 atoms
Therefore;
25 = 50 × (1/2)^n
1/2 = (1/2)^n
Thus; n = 1
n = 1 which is equivalent to 1.25 billion years
Therefore;
<u>Potassium-40 has a half life of 1.25 billion years.</u>
Answer:
Alleles contribute to the organism's phenotype
Explanation:
-Are always excitatory
-Produce end-plate potentials that almost always bring the postsynaptic muscle cell to threshold
-Almost always produce muscle
contractions when the synapse is active
-Are always excitatory and produce end-plate potentials that almost always bring the postsynaptic muscle cell to threshold
-Produce end-plate potentials that almost always bring the postsynaptic muscle cell to threshold and almost always produce muscle contractions when the synapse is active
Answer:
See Explanation
Explanation:
Yes, this is true because some bacteria in our environment tends to either fend off of or kill other types of bacteria. In this case, this bacteria is helpful because it turns gaseous nitrogen into a form that can be absorbed and used by plants in our environment.