60 years is three half life for the substance, so 40*1/2^3=5
Answer:
Photosynthesis removes carbon dioxide from the atmosphere, and cellular respiration puts it back. Photosynthesis releases oxygen into the atmosphere, and cellular respiration uses oxygen to release energy from food. ... The Calorie used on food labels is equal to 1000 calories
Explanation:
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The answer is stem cells. Normal stem cells and germ cells can also be said to be immortal