Answer:
The initial amount, 1.3 million = 1,300,000 is the 100%.
now, 640,000 is a given percentage (lower than 100%) of that.
How we can find it?
suppose that 640,000 represents an x%.
Then we have that the quotient between the actual quantities and the percentages must be the same
(640,000/1,300,000) = x%/100%
x% = (640,000/1,300,000)*100% = 49.23%
Then the percentage declined is:
100% - 49.23% = 50.77%
The other question can not be answered with the given information.
In order to calculate the percentage decline over the period of time between 1979 and 2007, the general formula for percentage change will be applied. This is as follows:
[tex]\frac{B-A}{A} \times 100[/tex]
where:
A = final value
B = initial value
In this problem:
A = Initial population = 1,300,000
B = Final population = 640,000
Applying this formula to the problem, the percentage change in population between 1979 and 2007 is as follows:
[tex]\frac{B-A}{A} \times 100\\\\\frac{640,000 - 1,300,000}{640,000} \times 100 \\\\\frac{-660,000}{1,300,000} \times 100\\\\= \frac{-66,000,000}{1,300,000} \\\\= -50.769 \%\\= 50.77\% \\Note\ that\ the\ minus\ sign\ denotes\ a\ decline.[/tex]
B: The change in range over this period of time is the difference between the final population and the initial populations, which is calcalated thus:
B - A (as explained above)
= 640,000 - 1,300,000 = - 660,000 (the minus sign still shows a decline)
While the percentage shows a "relative change" in terms of percentage, the change in range shows an absolute or actual change.
A similar example might help you understand more, check it out here: https://brainly.com/question/12291963?referrer=searchResults
How could these objects be classified: steak knife, screw, and saw blade? A. Objects made of metal B. Objects used for cutting C. Objects used to sew clothing D. Objects with handles
Answer: A.
Explanation: They are all made of metal
nothing dhsjfbbbbbb rdfsedsf
Answer:
haha
Explanation:
Which of the following is not one of the top five greenhouse gases? A. Methane B. Water vapor C. Carbon monoxide D. Ozone
Answer:
carbon monoxide
I did the test and notes and got it right!!!!
Explanation:
All fish nitrogen into the water as ammonia and organic nitrogen. These chemicals are byproducts of their metabolism and respiration.
Answer:
The correct answer would be - release/excretes.
Explanation:
In ponds, rivers, or similar ecosystem nitrogen cycle is completed with the help of the fishes. In this ecosystem, the nitrogen cycle initiates with the eating plants or fish food by the fishes and performs metabolism and cellular respiration which produces byproduct ammonia and organic nitrogen as animal waste.
This waste is released or excreted by the fish in the water where the beneficial bacterium helps in restoring nitrogen back to the atmosphere by breaking these wastes.
Which was a consequence of the Haymarket Square Riot?
eroded support for the Knights of Labor
boosted support for the Knights of Labor
eroded support for the American Federation of Labor
boosted support for the American Federation of Labor
Answer: A. eroded support for the Knights of Labor
Explanation: Trust me!
Answer: eroded support for the Knights of Labor
Explanation:
I got it right on the test :)
How many bacteria will there be after four hours from a single bacterium that divides to produce two cells every 15 minutes
Answer:
65,536 cells
Explanation:
According to the question, a single bacterium will divide into new cells every 15minutes. Since there are four 15 minutes in one hour, which is 60 minutes, a single bacterium will have divided (4×60/15) times =
= 240/15
= 16 times.
Since a single bacterium will divide 16 times in four hours cells, then in four hours, a single bacterium will have divided into 2^16 = 65536 new cells.
Note that, the number of cells a bacterium cell that will divide in two can be expressed as 2^n where n is the number of times
If a bacterium divides into 2 every 15 minutes, there would be 65536 bacteria after four hours.
The bacterium divides into 2 every 15 minutes. Thus, the cell will divide:
60/15 x 4 = 16 times in 4 hours
Thus:
First division = 2 cellsSecond division = 4 cellsThird division = 8 cellsFourth = 16 cellsFifth = 32 cellsSixth = 64Seventh = 128Eighth = 256Ninth = 512Tenth = 1024Eleventh = 2048Twelfth = 4096Thirteenth = 8192Fourteenth = 16384Fifteenth = 32768Sixteenth = 65536More on bacterial division can be found here: https://brainly.com/question/621474
Asap!!! I need urgent help, this is biology, and I don't understand much
Polar molecules have ends or poles that are partially charged. The opposite ends of a polar molecule will
have____.
A. the same type of charges
B. opposite charges
Answer:
B. opposite charges
Explanation:
Polarity is a separation of electric charge leading to a molecule or its chemical groups having an electric dipole moment, with a negatively charged end and a positively charged end.
Polar molecules must contain polar bonds due to a difference in electronegativity between the bonded atoms.
What is the role of the biomolecule represented in this diagram?
Answer:
provides energy and insulation
Explanation:
the biomolecule is carbohydrates or lipids
Which type of sensory receptor enables you to see?
Answer:
the type of sensory receptor that enables an individual to respond to see is the sensory receptor called, photoreceptor.
HOPE THIS HELPS!
I need some help! What cell structure goes to what? The structures as well as the descriptions are below
Match each cell structure below with its major functions.
lysosome
vesicle
nucleus
Golgi apparatus
chloroplast
smooth endoplasmic reticulum
nucleolus
rough endoplasmic reticulum
ribosome
mitochondrion
1.
contains chlorophyll, site of photosynthesis
2.
contains chromosomes, directs cell’s activities
3.
contains hydrolytic enzymes
4.
membranous network that detoxifies and helps synthesize lipids
5.
membranous network that helps synthesize proteins
6.
modifies and stores the products of the ER
7.
site of cellular respiration and ATP production
8.
site of protein synthesis
9.
site of ribosomal RNA synthesis
10.
small membrane-bound sac within a cell
Answer:Cells have many structures inside of them called organelles. These organelles are like the organs in a human and they help the cell stay alive. Each organelle has it's own specific function to help the cell survive. The nucleus of a eukaryotic cell directs the cell's activities and stores DNA.
4. Adaptive radiator
different habitats and few competitors, thus diversifying rapidly into several new
O True
O False
5.
increases the frequency of adaptive mutations in a population over time.
(select only one answer)
O Fitness
O Natural selection
Artificial selection
Adaptive radiation
6. Any change in allele frequencies in a gene pool is called
2
(select only one answer)
natural selection
Answer:
The correct answer is-
4. true
5. Natural selection
6. microevolution
Explanation:
Adaptive radiation is a cycle where living beings diversifying rapidly from a familial or an ancestral species into a huge number of several new types, especially when there are new environmental aspects present such as different habitats and few competitors.
Thus, it is a true statement.
Natural selection is the cycle through which a population or a species of living beings adjust and change over the period of time. natural selection just acts upon the heritable attributes of a population by choosing for advantageous alleles or and in this manner increasing the frequency of these adaptive alleles in the population.
Thus the option Natural selection is correct.
Changes inside a genetic pool from happening to one generation to another is known as microevolution. Allele frequencies in a population may change because of, natural selection, mutation, genetic drift, and genetic flow.
Thus, the correct answer is - microevolution.
Without leaves green plants could not
Answer:Without leaves green plants could not live.
Explanation:because from leaves a plant take breath or do respiration. In leaves of plants there are small pores or stomata from where they breathe. So if we can't breathe we can't live.so,Without leaves green plants could not live.
I need help please!!
Answer:
Prokaryotes and Eukaryotes are two types of cells with similarities and differences. Eukaryotes are plant cells and animal cells. They are mostly found in multi-cellular organisms. Prokaryotes are usually single-celled organisms and have a tail. Those are the examples that I remember, but there are way more similarities and differences. I hope this helped!!
PLS ANSWER ASAP 100 POINTS. Which of the following choices A, B, C or D best describes the enzyme reaction graph below? Justify your choice.
Answer:
you havent given a graph.
Explanation:
which statement describes how diffusion works? answer for edgenunity
Answer:
Diffusion is the movment of particles from an area of high concentration to a low concentration down a concentration gradient
the answer is c on e
Which the these questions is scientific
Which questions are you talking about?
Can you help me i will give you a branlist
Answer:
It means Practice makes Perfect
Explanation:
Help due tomorrow!!!
During one year, seven coyotes in a population die. Eight immigrate into the population, but none emigrate. If the overall population growth is 13 coyotes, what was the birth rate of coyotes during the year? 35 points
Answer:
12
Explanation:
UESTION 22
The human population has been able to grow exponentially
due to man's ability to manipulate resources.
true or false
Answer:
false
Explanation:
Enzymes are proteins that act as catalysts. The shape of enzymes can be altered by changes
in pH or temperature. Explain how this change of shape affects the function of the enzyme.
Answer:
Explanation:
Enzymes are proteins that act as catalysts. The shape of enzymes can be altered by changes
in pH or temperature. Explain how this change of shape affects the function of the enzyme.
what is the normal relationship between pressure and temperature
Answer:
Gay-Lussac's Law: The Pressure Temperature Law. This law states that the pressure of a given amount of gas held at constant volume is directly proportional to the Kelvin temperature. With an increase in temperature, the pressure will go up.
Explanation:
6.What are the Interdisciplinary fields that are linked to Environmental
Science?
Answer:
Environmental science is an interdisciplinary academic field that integrates physical, biological and information sciences (including ecology, biology, physics, chemistry, plant science, zoology, mineralogy, oceanography, limnology, soil science, geology and physical geography, and atmospheric science).
For something to be considered living, it must be composed of at least one what?
Answer:
[tex]\boxed {\tt Cell}[/tex]
Explanation:
There are many characteristics of life, including, cells. A cell is a tiny unit of life that carries out many different processes.
If something is considered living, it must have at least one cell, but it can have more. For example, bacteria is unicellular and living. We (humans) are also living, but made of billions of cells.
Therefore, for something to be considered living, it must be composed of at least one cell.
A chemical is added to cells, stopping all the activity of ribosomes. What is the result?
A. lipid synthesis stops
B. protein synthesis stops
C. cellular respiration stops
D. transcription stops
Answer:
The answer is B.
Explanation:
The function of ribosome is to assemble amino acids to make protein.
(Correct me if I am wrong)
what will happen if there is no mitrochondria in a cell
Biology may be defined as the ______ of ________ according to your lesson. o.o
1 life
2 study
3 hypothesis
4 fact
5 theory
Which of the following is a testable hypothesis?
A. Garden plants grow better in wet soil than in dry soil.
B. After a long discussion, the people at the meeting finally agreed
that it was time for lunch.
C. Cats have a completely different personality in comparison to
dogs.
D. Classical music is better than jazz because stringed instruments,
like violins, are used.
Answer: A
Explanation:
Answer:
im thinking A
Explanation:
Certain unusual aspects of brain structure were observed in the brain of Albert Einstein. One interpretation is that he was born with certain differences in his cortex from others that encouraged his scientific and intellectual abilities. What do you think of this explanation and what do you think could be an alternative interpretation
Answer:
It seems a plausible inference. An alternative hypothesis is one in which this anatomical difference is present in low population frequency, thereby further scientific observations are needed to confirm (or reject) this hypothesis
Explanation:
Albert Einstein's brain exhibited an unusual anatomical conformation in the prefrontal cortex. Intriguingly, this brain area is involved in abstract thinking, thereby it has been suggested that the amazing cognitive capacities of Einstein may be due to his prefrontal cortex. A way to test this hypothesis is by an observational study with the aim at determining if this feature is exclusive of Einstein's brain.