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3 years ago

why did the researchers add filtrate which macerated moss had been removed to control microcosms?(worth 5marks)

1 answer:

5 0

The researchers in question opted to remove the macerated moss from the control group in order to guarantee that the results were accurate.

The experiment in question consists of:

Placing volcanic rock samples into two glass containers
Adding to one container the mixture of macerated moss and water
The other container is the control, it receives only water
The goal is to measure the release of minerals from the rocks.

When performing an experiment, the control group is of vital importance. The presence of a control group ensures the accuracy of an experiment.

Given that moss is grown on rocks and will erode the rock over time, the researchers opted to remove it from the control sample. Minerals present in the rock might mistakenly be measured as minerals released from the volcanic sample, thus making the results of the experiment inaccurate.

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Components of saliva include______. Multiple select question. gastrin and pepsin salivary amylase bicarbonate umami lingual lipa

Archy [21]

The components of saliva include salivary amylase, bicarbonate and lingual lipase.

<h3>What is the components of saliva?</h3>

Saliva is the clear serous liquid the is secreted in the several salivary glands located at the buccal cavity of the head.

The components of saliva includes the following:

Salivary amylase,

bicarbonate and

lingual lipase.

Salivary amylase and lingual lipase are salivary enzymes that are used for the onset digestion of carbohydrate and lipids respectively. While bicarbonate is one of the electrolytes found in saliva.

Therefore, the components of saliva include salivary amylase, bicarbonate and lingual lipase.

Learn more about saliva here:

brainly.com/question/882651

5 0

3 years ago

A fossil is discovered that has only 12.5% of the carbon-14 that it would have had originally (when the animal was alive). If th

mariarad [96]

Answer:

The fossil is 17,100 years old.

Explanation:

The decay equation:

$\frac{dN}{dt}\propto -N$

$\Rightarrow \frac{dN}{dt}= -\lambda N$

$\Rightarrow \frac{dN}{N}= -\lambda dt$

Integrating both sides

$\Rightarrow \int\frac{dN}{N}= \int-\lambda dt$

$\Rightarrow ln |N|=-\lambda t+c$

When t=0, N= $N_0$ = initial amount

$ln |N_0|=-\lambda .0+c$

$\Rightarrow ln |N_0|=c$

$\therefore ln |N|=-\lambda t+ln|N_0|$

$\Rightarrow ln |N|-ln|N_0|=-\lambda t$

$\Rightarrow ln |\frac {N}{N_0}|=-\lambda t$

$\Rightarrow \frac {N}{N_0}=e^{-\lambda t}$

$\Rightarrow N=N_0e^{-\lambda t}$

The decay equation is

$N=N_0e^{-\lambda t}$

Given that,

The half life of carbon - 14 is 5700 years.

For half life, $N=\frac{1}{2} N_0$

To find the value of $\lambda$ , we need to put the value of N and t in the decay equation.

$\frac12N_0=N_0e^{-\lambda \times 5700}$

$\Rightarrow \frac12=e^{-\lambda \times 5700}$ [ Divided $N_0$ both sides]

Taking ln both sides

$\Rightarrow ln| \frac12|=ln|e^{-\lambda \times 5700}|$

$\Rightarrow ln| \frac12|={-\lambda \times 5700}$

$\Rightarrow \lambda= \frac{ln| \frac12|}{-5700}$

$\Rightarrow \lambda= \frac{ln|1|-ln|2|}{-5700}$ [ $ln|\frac mn|= ln |m|-ln |n|$ ]

$\Rightarrow \lambda= \frac{ln|2|}{5700}$ [ln 1= 0]

The fossil has only 12.5% of the carbon carbon-14 that it would have had originally.

So, $N=\frac{12.5}{100} N_0$

Then,

$\frac{12.5}{100} N_0=N_0e^{-\frac{ln|2|}{5700}t$

$\Rightarrow \frac{12.5}{100} =e^{-\frac{ln|2|}{5700}t$

Taking ln both sides

$\Rightarrow ln|\frac{12.5}{100} |=ln|e^{-\frac{ln|2|}{5700}t}|$

$\Rightarrow ln|\frac{12.5}{100} |={-\frac{ln|2|}{5700}t}$

$\Rightarrow t=\frac{ ln|\frac{12.5}{100}|} {-\frac{ln|2|}{5700}}$

$\Rightarrow t=\frac{ ln|\frac{12.5}{100}|\times 5700} {-{ln|2|}}$

$\Rightarrow t=17,100$

The fossil is 17,100 years old.

7 0

4 years ago

What happens when two species occupy the exact same niche

Papessa [141]

There will always be one stronger species that take over, which is what evolution has taught us.

I believe the answer would be D. Only one will survive.

Have a good day!

4 0

4 years ago

Read 2 more answers

. A 75-year-old woman and her 9-year-old granddaughter were in a car accident in which both sustained trauma to the chest while

Shkiper50 [21]

Answer:

The finding is expected. This is due to older people having a very depleted amount of proteins and calcium which affects their bone density.

Aged people have a large amount of osteoclasts which is responsible for the the breakdown of bone for repairs and remodification which poses a great risk for decreased and weakened bones.

The 9 yr old grand daughter however has large amounts of osteoblasts which help in bone production and translates to stronger bones.

This features and findings are the assumed and likely reasons why the 75yr old woman had fractures and the 9 yr old grand daughter suffered none.

7 0

3 years ago

Why shouldn't you have more than one independent variable

quester [9]

There are often not more than one or two independent variables tested in an experiment, otherwise it is difficult to determine the influence of each upon the final results. There may be several dependent variables, because manipulating the independent variable can influence many different things.

7 0

3 years ago

Read 2 more answers

why did the researchers add filtrate which macerated moss had been removed to control microcosms?(worth 5marks)​

why did the researchers add filtrate which macerated moss had been removed to control microcosms?(worth 5marks)