1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Arada [10]
3 years ago
14

The paleozoic era lasted for about how many years

Biology
2 answers:
blsea [12.9K]3 years ago
8 0
Paleozoica era lasted from 250 to 550 million years ago. At this time the Earth's surface has undergone great changes, including the emergence of mountainous sets as the Scandinavian Alps. This geologic era also is characterized by the occurrence of sedimentary rocks and metamorphic rocks, formation of large forests, glaciations, emergence of the earliest insects and reptiles<span>.

hope this helps!</span>
11111nata11111 [884]3 years ago
7 0

292 million years is the answer

You might be interested in
Both male and female rats have genotype Bb. Based on the Punnett square, Carol concluded that the phenotypic ratio of the monohy
Crank
The ratio should be 1:2:1. Carol concluded that there are 2 homozygous dominant, 1 heterozygous, and 1 homozygous recessive.
However, it should be 1 homozygous dominant, 2 heterozygous, and 1 homozygous recessive.
7 0
3 years ago
Read 2 more answers
PLZ help quick I really really really really really really need help
Zepler [3.9K]
It is water soil and temperature
3 0
3 years ago
Read 2 more answers
If a sound gets louder, the .....of its vibrations increases.
Vadim26 [7]

Answer:

I think Amplitude

Explanation:

5 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 = Xoe^{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
True or false? Monozygotic (or identical) twins can have small genetic differences.
zysi [14]
True, they can have genetic differences.
6 0
3 years ago
Other questions:
  • Puberty is defined as ________. the production of hormones in the reproductive glands stimulated by the pituitary gland the stag
    11·2 answers
  • If you had three apples and four oranges in one hand and four apples and three oranges in the other hand, what would you have?
    15·2 answers
  • What is the benefit of a scientific name vs. a common name?
    10·2 answers
  • The spread of HIV and hepatitis in the health care setting can usually be traced to: Select one: a. noncompliance with standard
    14·1 answer
  • What would happen to the size of the carnivore population if the herbivore population increased?
    6·1 answer
  • ASAP
    15·1 answer
  • Is the correct order in a homeostatic feedback system stimulus, receoptor, control centre, effector?
    5·1 answer
  • Correlate crossing-over with genetic linkage
    12·1 answer
  • When we speak, air from our lungs rushes across the __________, causing them to vibrate.
    12·1 answer
  • What are the three main parts of an rna nucleotide.
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!