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sasho [114]
3 years ago
12

How does the immune system protect the body against

Biology
1 answer:
Anestetic [448]3 years ago
6 0
Changes cause by harmful pathogens
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The correct answer is b. an operational definition.  

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An operational definition constitutes the set of procedures that describe the activities that an observer must carry out to receive sensory impressions, which indicate the existence of a theoretical concept to a greater or lesser degree. In this sense, it tries to clearly indicate how the variables are going to be manipulated or measured and also indicates that to measure a variable, it is necessary to carry out a series of activities or procedures. It is the one that builds or adapts from others, based on the observable characteristics of the phenomenon; indicating the concrete, empirical elements or indicators of the fact to be investigated.

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periods in which new species appear relatively quickly are associated with the theory of . a. punctuated equilibrium b. reproduc
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A pattern of rapid evolutionary change followed by long periods of stagnation is a pattern explained by an interrupted equilibrium. Punctuation equilibrium states show that organisms do not change much as they appear in the fossil record.

Interrupted equilibrium predicts that many species evolutionary changes occur on short time scales associated with speciation events.

An intermittent equilibrium occurs as genetic variation passes more rapidly, increasing the rate of evolution and speciation. Tyrannosaurus fossils and mollusks species from the Turkana Basin are examples of intermittent equilibrium.

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