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nirvana33 [79]
1 year ago
6

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.
Biology
1 answer:
mr_godi [17]1 year ago
8 0

In natural experiments, the researcher compares groups exposed or not to exogenous agents, but does intervene in group composition or independent variable modification. This is a natural experiment.

<h3>What is a natural experiment?</h3>

There are two types of investigation strategies,

  • Natural investigation
  • Manipulative investigation

In a natural experiment the researcher does not intervene in the creation of treatment and control groups.

There is an exogenous agent, such as a natural phenomenon, that influences the study groups and that acts as the treatment.

The researcher takes advantage of these events to use these random groups to compare them in the study.

The researcher chooses exposed groups (experimental groups) that might have been affected by the natural event and other groups that have not been affected (control groups).

In the exposed example,

  • Exogenous agent ⇒ Treatment ⇒ pesticide use
  • Exposed group ⇒ Experimental group ⇒ birds from nests in pesticide-sprayed fields
  • Not exposed groups ⇒ Control groups ⇒  birds from nests in unsprayed fields.

Since the researcher does not voluntarily modify the independent variable to observe a response in the dependent variable, this experiment could not be considered to be manipulative.

This is an example of a natural experiment in which the researcher chooses groups exposed to different conditions to compare them and analyze the effect of the pesticide.

You can learn more about natural experiment at

brainly.com/question/5001950

#SPJ1

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A small bowel resection.
6 0
3 years ago
Henrietta is in the fifth week of her pregnancy, which means that she is in the _____ period of prenatal development.
Talja [164]

Answer:

Embryonic period

Explanation:

The time period of the growth of the baby in the womb of the mother of human is 38 weeks or 9 months.

The time period of 38 weeks is divided into three phases related to the events taking place in that period which are: the germinal period, embryonic period and the fetal period.

  • The germinal period lasts from the implantation to the gastrula phase during which the germ layer begins to form that is in the first and second week.
  • The embryonic phase begins after the second week and lasts about the eighth week which is marked by the phase of embryonic and differentiation.

Therefore, in the fifth week she is in the embryonic phase of prenatal development.

8 0
3 years ago
The mammary glands enlargement during pregnancy primarily as a consequence of what hormonal process?
Masteriza [31]

Answer:

c-hormonal hyperplasia

Explanation:

When there is increase in the number  of cells and tissues that appear normal under the  microscope,Hyperplasia is said to occur.If these occur in cells of an endocrine gland of a system,then it is refers to as hormonal hyperplasia.

Therefore during pregnancy,the proliferation of the glandular epithelium  in a pregnant woman (and at puberty in a females are examples of hormonal hyperlasia.

Its possible causes are;

a  surge in local production s of growth factors,

In the numbers of growth factors receptors on the  cells receptive to the factors,

and   due to activation of   specific intrancellular signalling pathways.

3 0
3 years ago
The end product(s) of the light-independent reactions of photosynthesis is/are - Select all that apply.
iren2701 [21]

Answer:

Glucose

Explanation:

The light dependent stage produces oxygen while the light independent stage produces glucose ( a carbohydrate)

Oxygen and glucose are the two products of photosynthesis.

7 0
3 years ago
3. Which is not an example of symbiosis?
S_A_V [24]

Answer:

The correct answer is B. generalism.

Explanation:

Mutualism is a symbiotic relationship wherein both organisms benefit from the other’s presence. Parasitism is a symbiotic relationship wherein one organism benefits at the expense of the other organism, which is harmed. Finally, commensalism is a symbiotic relationship wherein one organism benefits and the other is neither helped nor harmed. Generalism does not refer to a symbiotic relationship and thus is the correct response.

Hope this helps!

6 0
3 years ago
Read 2 more answers
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