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4 years ago

6

To which two organ systems does the pharynx belong?

1 answer:

NeX [460]4 years ago

5 0

Expiratory system or sometimes we draw it for digestive system too

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Arrange the events to describe how a volcano forms and erupts.The plates move constantly.

VikaD [51]

Earth's crust is made up of huge slabs called plates. The plates move constantly. At times, the plates move away from each other, creating gaps. Earth's surfaces finds it's way out of the gaps. Magma comes out of Earth, creating a heap of lava, ash, and rocks. The heaps grows bigger and bigger as the volcano erupts and, creating q huge mound. The mound cools down over thousands over years to form a mountain.

8 0

3 years ago

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 $e^{kt}$

[<em>e</em> 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 $e^{k40}$

<em>Divide (ii) by (i)</em>

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

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

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

<em>Take the natural log of both sides</em>

㏑20 = 20k

<em>[taking the ㏑ cancels the exponential]</em>

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

<em>We can now substitute k to solve one of the equations</em>

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

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

2000 = Xo $e^{6}$

<em>Making Xo the subject of the formula</em>

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 $e^{0.15t}$

<em>solving for t:</em>

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

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

Pick two ways do salts enter the ocean.

netineya [11]

I think the answer is 3 and 4

3 0

4 years ago

1. It is a picture please it is for homework i really need help

Natali5045456 [20]

Answer:

0-20 seconds

your welcome

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3 years ago

Do 1. Different types of mutations can occur in DNA. The diagram represents a

wariber [46]

Answer:

A

Explanation:

3 0

3 years ago