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STatiana [176]
3 years ago
7

If a rock was determined to be around 3.9 billion years old how much Potassium 40 would be left in that rock sample? (Percentage

of Potassium 40)
Biology
1 answer:
jek_recluse [69]3 years ago
6 0

What percent of potassium-40 remains undecayed in a rock that is 3.9 billion years old? The 3.9 billion year old rock has undergone three half-lives (3.9 divided by 1.3 = 3). After 3 half-lives, 12.5% of the potassium-40 remains undecayed.

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Which of the following methods do scientists use to measure the amount of carbon dioxide in the atmosphere?
slamgirl [31]

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<h3>What is the amount of carbon dioxide in the atmosphere?</h3>

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Which traits are challenges of life for all organisms? Choose all answers that are correct. A. reproducing B. getting sunlight C
RUDIKE [14]
<span><span>a.   </span>Reproducing</span>
f. obtaining energy
d. maintaining structure

Why do these three illustrate the great challenge for every species. <span><span>
1.   </span>Reproduction, is as vital for an entire race to survive. It prolongs their generation onwards and offspring to the next centuries to pass by.</span> <span><span>
2.   </span>Obtaining energy. In both humans and animals, even plants is a challenge because these creatures need to work in order to obtain these need resource from food –preys.</span> <span><span>
3.   </span><span>Maintaining structure. For the living organisms to still exist they need to keep themselves intact. Combating diseases and having nutrition. This is a by-product of having energy.  </span></span>



3 0
3 years ago
What come first a chicken or the egg?
bazaltina [42]
Egg cause thingsnwere laying eggs before chickens were. and first chicken was a genetic mutation.
3 0
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Anastaziya [24]

Answer:

C

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