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3 years ago

When does fluvial erosion begin?

Biology

1 answer:

tamaranim1 [39]3 years ago

3 0

Well Fluvial processes include the movement of Sediment and erosion or deposition.

I think the best answer here is "C"

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The count in a bacteria culture was 100 after 20 minutes and 2000 after 40 minutes. Assuming the count grows exponentially, What

Afina-wow [57]

Answer:

Explanation:

Let X be the number of bacteria at time t, and Xo be the initial number of bacteria

Bacteria grows exponentially, the exponential growth model is thus:

X = Xo $e^{kt}$

[e is the exponential sign]

k is the growth constant = growth rate

At t = 20 minutes, X = 100

At t = 40 minutes, X = 2000

Substituting that into the formula

(i) ... 100 = Xo $e^{k20}$

(ii) ... 2000 = Xo $e^{k40}$

Divide (ii) by (i)

$\frac{2000}{100} = \frac{Xoe^{40k} } {Xoe^{20k}}$

20 = $e^{40k-20k} = e^{20k}$

[Xo cancels Xo. Division of values raised to a power is done by subtracting their powers]

Take the natural log of both sides

㏑20 = 20k

[taking the ㏑ cancels the exponential]

k = $\frac{ln20}{20}$

We can now substitute k to solve one of the equations

substituting k in (ii): 2000 = Xo $e\frac{ln 20}{20}.^{40}$

2000 = Xo $e^{0.15*40}$

2000 = Xo $e^{6}$

Making Xo the subject of the formula

Xo = $\frac{2000}{e^{6} }$

Xo is approximately 5 cells.

THE DOUBLING TIME

The doubling time is the time it takes for the population to double, so 5 cells become 10 cells

Since Xo = 5

Given that X = Xo $e^{kt}$

When X=10,

10 = 5 $e^{0.15t}$

solving for t:

$e^{0.15t} = \frac{10}{5}$

Take ln of both sides

0.15t = ln 2

t = $\frac{ln2}{0.15}$

t =4.62 minutes

POPULATION AFTER 65 MINUTES

X = 5 $e^{0.15*65}$

X = 85770

WHEN WILL THE POPULATION REACH 12000

12000 = 5 $e^{0.15t}$

$e^{0.15t}$ =240

take ln of both sides

0.15t = ln 2400

t = 51.89 minutes (approximately 52 minutes)

6 0

3 years ago

11)

shtirl [24]

Answer:

Mitochondria and Chloroplasts

Explanation:

Mitochondria and plastids (like chloroplast) each have their own DNA due to at one point being prokaryotes with their own DNA.

7 0

3 years ago

Apoorwa, What is the function of a nucleus in a plant cell and a endoplasmic reticulum

son4ous [18]

Answer:

It stores the cell's hereditary material, or DNA, and it coordinates the cell's activities, which include intermediary metabolism, growth, protein synthesis, and reproduction (cell division).

Explanation: :))

5 0

3 years ago

The surgical removal of the membrane that lines the interior of a joint is known as a?

Norma-Jean [14]

The surgical removal of the membrane that lines the interior of a joint is known as Joint Synovectomy.

The surgical removal of the synovial membrane, the tissue that lines the joint capsule, is known as a joint synovectomy.

The body's synovium surrounds the joints and creates synovial fluid to lubricate the joint and promote easy mobility.

The joint disease causes the synovium to inflame (synovitis) and overproduce synovial fluid, which contains an enzyme that can eat away at the cartilage on the joint surface, causing bone-on-bone on bone joint discomfort.

When you have a painful, disabling joint issue that does not improve with non-surgical treatments including rest, drugs (NSAIDs) or corticosteroid injections, and physical therapy, your surgeon will typically advise joint synovectomy.

Hence, the surgical removal of the membrane that lines the interior of a joint is known as Joint Synovectomy.

Learn more about Joint diseases here brainly.com/question/9639571

#SPJ4

7 0

2 years ago

What are the products of photosynthesis? Where do they go?

Soloha48 [4]

Oxygen and glucose are the products of photosynthesis. Oxygen is used by plant for respiration or it gets dissipated in the air. Glucose is stored for feeding the plant. It is also stored in the form of starch

8 0

4 years ago

Read 2 more answers