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
wariber [46]
3 years ago
9

In other cases, researchers use natural experiments in which the dependent variable (typically a measure of organism health) is

measured under differing contexts that are not manipulated. Say, for example, that an accidental chemical spill contaminates five ponds. To determine the possible effects of the toxic chemical on frogs, a researcher could compare the hatching rate of frog eggs laid in those five ponds to the hatching rate of eggs laid in five uncontaminated ponds nearby. This would be an example of a natural experiment because concentrations of the toxic chemical in the ponds were not controlled by the experimenter, but rather resulted from the chemical spill.
Drag type of experiment on the left to the example of experiment on the right.
A. Natural
B. Manipulative
1. ______: Blood concentrations of BPA in college students are compared to their recent consumption of canned food items
2. _____: The feeding behavior of fish in streams that receive acidic runoff from strip mines is compared to the feeding behavior of fish in unaffected streams.
3. _____: The deformity rate in baby birds from nests in pesticide-sprayed fields is compared to the deformity rate in birds from nests in unsprayed fields.
4 ______: Tumor development is compared in mice exposed to five dosages of a known carcinogen in the laboratory.
5. ______: Foraging activity levels are compared in tadpoles exposed to four concentrations of toxic metals in the laboratory.
6. ______: Growth of corn plants is compared in field plots sprayed with three different dosage:s of weed killer 7.
7. ______: BPA concentrations in the urine of people with diabetes are compared to BPA concentrations in the urine of people without diabetes
Biology
1 answer:
slavikrds [6]3 years ago
6 0

Answer:

1. Natural

2. Natural

3. Manipulative

4. Manipulative

5. Manipulative

6. Manipulative

7. Natural

Explanation:

1. Checking the blood concentration of BPA in college students in relation to their recent consumption of canned food items is a natural experiment because BPA concentration in blood is not artificially controlled by any means.

2. Comparing the feeding behavior of fish in streams with acidic runoff to that of fish in an unaffected stream is a natural experiment due to the fact that the acidity of the stream is not artificially controlled in any way by the experimenter.

3. Checking the deformity rate in baby birds from nests in pesticide-sprayed fields and that from unsprayed fields would require some manipulations except a sprayed and unsprayed one already existed long before the experiment was given birth to. Otherwise, the sprayed field might need to be artificially created just for the purpose of the experiment.

4. A known carcinogen would need to be administered to a group of the mice. This is manipulative.

5. The tadpoles would need to be artificially exposed to the toxic metals in the laboratory. Manipulative

6. The spraying would need to be carried out artificially in order for the comparison to be made. Manipulative

7. People with diabetes cannot be artificially created. They must have existed naturally long before the experimental design. Natural

You might be interested in
Muscle cells, which need a lot of ATP, would be expected to have a lot of _______, the organelles involved in cellular respirati
Naddik [55]
Its <span>mitochondria im sure 

</span>
8 0
3 years ago
Read 2 more answers
Which statement is False?
timofeeve [1]

Answer:a

Explanation:

4 0
3 years ago
The same sentences are written with a substitution, deletion, or insertion, much as a gene may have a substitution, deletion, or
strojnjashka [21]

Answer:

The question is incomplete, the complete question has been added as an attachment.

THE DGR AN represents deletion mutation

THE RED ANA TRA N represents insertion mutation

THE FOX WTS RED represents substitution mutation

Explanation:

Mutation is a change in the nucleotide sequence of a gene. It can be of different types depending on how it occurs. A deletion mutation is that which involves the removal of one or more nucleotide base from the sequence.

An insertion mutation is the addition of one or more nucleotide bases to the sequence.

A substitution mutation is the replacement of one or more nucleotide base in a sequence.

The original sentences were:

1. THE RED ANT RAN

2. THE FOX WAS RED

3. THE DOG RAN

The three sentences that mutated/changed are:

1. THE DGR AN- in this sentence, letter O which represents one base is missing due to removal, making the original sentence (THE DOG RAN) alterated. Hence, this represents an example of deletion mutation.

2. THE RED ANA TRA N - in this case, Letter A has been added in between N and T. This makes the original sentence (THE RED ANT RAN) altered. Since addition of letter (base) occurred, this represents an example of insertion mutation.

3. THE FOX WTS RED - In this case, letter A in "WAS" was replaced by T, making the original sentence (THE FOX WAS RED) altered. Since a replacement of letter (base) is the case here, it represents an example of substitution mutation.

8 0
3 years ago
Because a pregnant clients diabetes has been poorly controlled throughout her pregnany, the nurse would be alert for which
lys-0071 [83]
Sorry I don't know just need comments to get points, desperate need of help with maths home work xx
5 0
3 years ago
Heavy rain falls in a region that feeds into a larger river. How might this reshape land features along the river?
Lesechka [4]
Heavy rain fall in a region means that the river will expand in size to accommodate the xtra h20. it reshapes the shore line. moving h20 over time can change the land features.
5 0
3 years ago
Read 2 more answers
Other questions:
  • Where do clams come from
    11·2 answers
  • ⦁ 1. What taxon (classification levels) are represented by the scientific name of an organism? What are the rules for writing th
    6·1 answer
  • In two to three sentences, explain what a cancer-causing gene is and how it can cause cancer.
    7·2 answers
  • what type of behavior is a caterpillar building a cocoon? A. instinct B. imprinting C. conditioning D. insight learning
    15·1 answer
  • Phoebe removes frozen vegetables from the freezer to make herself a stir-fry. She’s in a bit of a hurry, so she immerses the pla
    7·2 answers
  • Which trait exhibits typical dominant/recessive inheritance in humans?
    7·1 answer
  • How does light intensity affect oxygen production?​
    15·1 answer
  • Which of the following order is correct in terms of the hierarchy of the organization?
    7·2 answers
  • Give three ways in which plants use the glucose made in photosynthesis.<br> Thanks
    14·1 answer
  • Researchers have found that mitochondria and chloroplasts in eukaryotic cells have their own DNA. This DNA is different from the
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!