Answer:
2, 3, 4 should all work although possible 1 as well
Explanation:
honestly any non petroleum and coal energys ource helps pH of water
Answer:
Left amount of Polonium-210 after 115 days will be 4.5927 microgram
Explanation:
We have given initial mass of Polonium-210 
Decay rate x= 0.502% = 0.00502
Time t = 115 days
We have to find the left amount of Polonium -210 after 115 days
We know that left amount is given by

So left amount of Polonium-210 after 115 days will be 4.5927 microgram
You should always keep calm and try to think positive never put your self down never ever
A non-living system would be a machine, such as an electrical system, air conditioning, etc. and a living system would be an animal, person, plant, etc.
Answer:
nucleotides
Explanation:
RNA and DNA are polymers made of long chains of nucleotides.