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gtnhenbr [62]
3 years ago
14

A group of scientists are studying the effects of different fertilizers on the growth of pea plants. They began their study with

10 pea plants. They gave each plant a different type of fertilizer and tracked their growth over a period of 2 months. the result of this experiment weren't considered valid by other scientists because there was no control group. which of the following represents an appropriate control group for this experiment?
Biology
1 answer:
katrin [286]3 years ago
8 0
A control group of the experiment is the one in which no treatment or intervention is given. So, in your case, the pea plants in which was not subjected any of the fertilizers, will serve as a control group. This is a negative control. A positive control group is the one in which an established treatment is given, which definitely leads to the production of the desired character. So, in your case, a very good well-known fertilizer which has a positive control on the growth of the pea plant, would serve as a positive control.
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Because for female sex link desease would require X°X° but for male X°Y so during crossing X linked dear are more common in male.
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2 years ago
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A chemical reaction is shown.
mixas84 [53]

Answer:

1) A chemical reaction is shown.

SnO2 + H2 → Sn + H2O

What is true about this chemical reaction?

B.

It is unbalanced because the mass of the reactants (number of atoms) is greater than the mass of the products (number of atoms).

2) Read the information about an experiment.  

Jadon plans on carrying out an experiment involving the burning of steel wool to illustrate the conservation of mass. Steel wool is made of iron. When it is burned it combines with oxygen to form iron(III) oxide.

Which step in his experiment is the most important if he wants his experiment to correctly demonstrate the conservation of mass?

A.

The steel wool should be burned inside of a sealed jar or other closed system.

Explanation:

The explanation to number 1 is that I selected it in my test and got it.

The explanation the number 2 is from the link below:

https://quizizz.com/admin/quiz/5dee60258f1145001bc02ed5/physical-science-2nd-9-weeks-practice-test-2020

8 0
2 years ago
whether or not you think humans have influenced climate change. Write 100 to 200 words and cite at least three pieces of evidenc
Nitella [24]

In my opinion, humans have influenced climate change because it has been shown that deforestation, industrial activities and urbanization increase the level of greenhouse gases.

<h3>What is global warming?</h3>

The expression global warming makes reference to the sudden increase in temperatures around the world after the industrial revolution.

In this regard, it has been shown that greenhouse gases such as CO2 can increase global warming and human activities may be associated with this process.

In conclusion, in my opinion, humans have influenced climate change because it has been shown that deforestation, industrial activities and urbanization increase the level of greenhouse gases.

Learn more about global warming here:

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2 years ago
What is the name of the process shown in the picture below?
Vikentia [17]

Answer:DNA replication

Explanation:

3 0
3 years ago
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The registered nurse is evaluating the statements of the student nurse after teaching about delegation. Which statement made by
Oxana [17]

Answer:

The options

"The delegatee should report the findings back to the delegator."

"The delegatee should understand the assigned task completely."

"The delegator should trust the delegatee to accomplish the task."

"The delegator should recheck and redo the work of the delegatee."

The CORRECT ANSWER IS

"The delegator should recheck and redo the work of the delegatee.

Explanation:

An effective leader must learn to effectively delegate tasks by appropriating the tasks based on skill and talent of his/her members in order to increase productivity and accuracy.

"The delegator should recheck and redo the work of the delegatee."✔

Time management is a necessary factor in delegation processes. If the delegator needs to rechecks and redoes the task assigned to the delegatee, it consumes time needed for other tasks and slows the process of achieving the task and results due to inappropriate delegation.

"The delegatee should report the findings back to the delegator."❌

Reporting the results after it's being carried out to the delegator would give the delegator a clear view on how the process of the task is going.

"The delegatee should understand the assigned task completely."❌

The delegatee needs to comprehend the task completely to perform to details as instructed by the delegator.

"The delegator should trust the delegatee to accomplish the task."❌

Trusting the delegatee decrease the time to get it done and promote a healthy working atmosphere.

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