Which of the following is considered an amphibian? 1. A bird 2. A frog 3. A goldfish 4. An iguana

Please help need answer.

olchik [2.2K]

Answer:

Non-use of drugs:

1. A teen is with family and friends.

2. A teen is a healthy student and athlete

3. A teen is focused and living life free and happy.

Use of drugs:

1. A teen doesn't socialize and doesn't around too many people due to social anxiety caused by the use of drugs.

2. A teen has health problems in his liver and kidney due to the abuse of drugs and is not able to play any sports due to this permanent health condition.

3. A teen is in jail due to being caught in possession of drugs and failing a drug test and being unhappy with anxiety and addiction.

3 0

2 years ago

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

3 years ago

In one experiment, Mendel grew 633 green pea plants with wrinkled seed covers. If the ratio of wrinkled seed plants to straight

Olenka [21]

Answer:

31

Explanation:

7 0

3 years ago

How would a scientist have made the distinction between a unicellular and a multicellular organism in the 17th century(1600s), t

Drupady [299]

Using a microscope

Explanation:

A microscope is a scientific device used for magnifying and studying very tiny features.

It was invented by Anton Von Leeuwenhoek in the 17th century.

A unicellular organism is an organism made up of a single cell.
A multi-cellular organism is made up of several cells.
A cell is a very small microscopic structure.
It is usually described as the fundamental unit of life.
Due to its small size, the naked eyes cannot see it
The invention of the microscope opened up the world of cells.
Since they have been around for a long time, distinction of cells would have been made possible at those times using a microscope.

learn more:

Microscope brainly.com/question/4065308

#learnwithBrainly

5 0

3 years ago

It is usually easier to calculate an enzyme's reaction velocity from the rate of appearance of .............. rather than the ra

elena-14-01-66 [18.8K]

Answer:

It is usually easier to calculate an enzyme's reaction velocity from the rate of appearance of PRODUCT rather than the rate of disappearance of a SUBSTRATE. Enzyme activity is measured as an INITIAL reaction velocity, the velocity before much SUBSTRATE has been depleted and before much PRODUCT has been generated. It is easier to measure the appearance of a small amount of PRODUCT from a baseline of zero PRODUCT than to measure the disappearance of small amount of SUBSTRATE against a background of high concentration of SUBSTRATE.

7 0

3 years ago