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Verdich [7]
3 years ago
13

In a certain species of pine trees, the short needles are dominant to long needles. when discussing the pine tree needles as bei

ng short or long we are referring to the
Biology
1 answer:
artcher [175]3 years ago
6 0

We are referring to the phenotype of the species.


The phenotype describes the set of observable characteristics of an species. It depends on the expression of genes (genotype) and the environment. For example, humans having type 2 diabetes can be linked to both genetic predispositions and poor eating habits.

Epigenetic modifications can also modify a phenotype. Epigenetics is a process that explains how environmental factors (diet, smoking, stress ...) influence the expression of genes and therefore the phenotype.

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Number the steps from when the stimulus received to when the body reacts​
Natasha2012 [34]

The given question is not complete. The complete question is:

Number the steps from when a stimulus is received to when the body reacts.

The stimulus is received by sensory receptors.

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Answer:

The body of an organism like humans reacts towards each of the external stimuli of the environment like the smell of the food and even to the internal stimulus like hunger or pain. Thus, it can be considered that one is stimulated all the time and reacts towards the constituents found in the surroundings. The entire procedure of the organism reacting towards the stimuli are as follows:  

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2. The stimulus information is further carried to the spinal cord or the brain by the sensory neurons.  

3. The processing of the information in the brain takes place with the assistance of interneurons.  

4. After that the response information is mediated towards the motor neurons by the interneurons.  

5. The motor neurons eventually result in the contraction of muscles showing that the body is reacting towards the stimulus.  

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