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Simora [160]
3 years ago
15

What is the main purpose of controlled variables in an experiment

Biology
1 answer:
Vika [28.1K]3 years ago
6 0
A controlled variable is not changed throughout an experiment. It is there so that the other variables being tested on can be better understood.
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How is a varied diet an advantageous adaptation for animals dwelling in the chaparral biome?
Ray Of Light [21]
<span>The chaparral is characterized by sparse, rough terrain and nutrient-poor soil meaning that no single resource is overly abundant. Therefore, a varied diet allows an animal to make use of a wider selection of the resources that are available to it and thereby thrive.</span>
3 0
3 years ago
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What part of the intestinal tract prevents backflow of food from the stomach into the esophagus? a. diaphragm b. lower esophagea
lara31 [8.8K]

Answer:

The correct option is b. lower esophageal sphincter

Explanation:

The esophagus is the initial part of the digestive tract and its function is the transport of the alimentary bolus from the pharynx to the stomach, through the thorax and avoid the reflux thereof. It begins and ends in two sphincter structures, the upper esophageal sphincter and the lower esophageal sphincter, which separate it from the pharynx and stomach. The lower esophageal sphincter has two functions: relax during swallowing and prevent reflux of the gastric contents into the esophagus in the postdeglutory period. After swallowing, there is a relaxation of the lower esophageal sphincter, pressure dropping to levels similar to those of the gastric fundus, which allows the bolus to enter the stomach. This relaxation lasts a few seconds and is followed by a strong contraction that prevents backflow of food.

4 0
3 years ago
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Which best describes the age structure of a population with zero population growth?
serious [3.7K]

Answer:

The correct option is D) The age-structure diagram would be column-shaped with all age classes approximately equal.

Explanation:

A zero population growth refers to a condition when the birth rate equals to the death rate. Social workers tends to find methods to attain zero population growth as such conditions provide economic stability. As the birth rate and the death rate will be equal hence the age structure diagram of such a population can be seen to be column shaped as they all will be equal.

5 0
3 years ago
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Answer:

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