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tiny-mole [99]
3 years ago
9

Explain how natural selection might be a mechanism of evolution

Biology
1 answer:
7nadin3 [17]3 years ago
5 0
Natural selection is a process in which the best adapted individual survives. In Darwin's studies on the Galapagos islands, he found 4 different bird species on 4 different islands. The islands were not that far from each other but it still took a while to get from one to the other. He discovered that the species were different because of their environment. Therefore, each specie was adapted to its environment. On the other hand, evolution is a long term process that adapts an individual to it's habitat. Therefore, by eliminating all individuals who are not able to survive, we are left with the ones who were able to live and reproduce and have children who will have changed a bit and will continue changing until the specie is completly adapted. That is the link between natural selection and evolution.
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The preferable option will be - B.

B. A 28-year-old anorexic female

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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.

Deriving the equation:

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

i.e

\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

where,

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

㏑(C)  - ㏑C₀ =  -kt

\dfrac{C}{C_o} = e^{-kt}

C(t) = C_oe^{-kt}

∴

The concentration of drug in blood at any time t is:

C(t) = C_oe^{-kt}

4 0
2 years ago
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