The answer is letter B.
Muscles in animals are often or almost always found in pairs because they need to be able to both push and pull. Pushing and pulling are the basic movements that the skeletal system can perform. It occurs when individuals are lifting, walking, running, among others. Almost all activities need the push and pull motion of muscles to balance out movements. Without this mechanism, we might easily fall over while walking (e.g. hamstrings are pulling back while the quadriceps are pushing forward).
Bacteria cells have no *nucleus*
Reason:
Prokaryotic cells lack most organelles, namely the nucleus, which contains genetic information and controls everything that goes on in the cell. Bacteria cells are prokaryotes, which means they do not have many of the organelles that eukaryotic cells have.
Resulting factors are called Second-order factors
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What is factor analysis?</h3>
- Factor analysis is a statistical approach for describing variability in seen, correlated variables in terms of a possibly smaller number of unobserved variables known as factors.
- It is possible, for example, that fluctuations in six known variables mostly reflect variations in two unseen (underlying) variables.
- Factor analysis looks for such joint fluctuations in response to latent variables that are not noticed.
- Factor analysis may be regarded of as a specific form of errors-in-variables models since the observed variables are described as linear combinations of the possible factors plus "error" terms.
- It may help to deal with data sets where there are large numbers of observed variables that are thought to reflect a smaller number of underlying/latent variables.
- It is one of the most commonly used inter-dependency techniques and is used when the relevant set of variables shows a systematic inter-dependence and the objective is to find out the latent factors that create a commonality.
To Learn more about factor analysis from the given link
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