Answer:
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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Explanation:
I think false because it make the leave heavier which causes it to become limb with water<span />
state of steady internal conditions maintained by living things.
The answer is; D
As the sunlight changes media from the atmosphere into the water, some of it is reflected back while the rest is refracted and diffused by the water. The deeper the water column the higher the diffusion. Therefore, leaves under water receive lower sunlight intensity hence slowing down the rate of photosynthesis.
10 is D. Unfortunately, I do not know number 9 sorry
