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lbvjy [14]
3 years ago
14

What is a key part of Darwin''s idea of natural selection? A. Earth is very old. B. Everything has a predator. C. Organisms'' ch

aracteristics are carried on DNA. D. More individuals are born than can live on available resources.
Biology
1 answer:
svp [43]3 years ago
8 0
"C. Organisms' characteristics are carried <span> on DNA.</span>" would be the best fit, although this still isn't really the core idea behind natural selection, which is that animals survive based on how "fit" they are for their environment.
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The rate at which the concentration of a drug in the bloodstream decreases is proportional to the concentration at any time t. I
Westkost [7]

Answer:

C(t) = C_oe^{-kt}

Explanation:

From the given information:

At any given time (t), let c(t) represent the concentration of the drug present in bloodstream.

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\dfrac{dC}{dt} decrease proportionally to Concentration C

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\dfrac{dc}{dt} \alpha - C

\dfrac{dc}{dt} = -k C

\dfrac{dc}{c} = -k dt

\int \dfrac{dc}{c} = -k \int dt

㏑(C) = -kt + λ

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λ is the integration constant.

Integrating at t = 0, concentration of blood = Co g/mL

C(0) = Co

㏑(C₀) = 0 + λ

λ = ㏑(C₀)

From ㏑(C) = -kt + λ

㏑(C) = -kt + ㏑C₀

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