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Soloha48 [4]
2 years ago
8

Testing hypotheses often involves designing experiments. Which of the following is the factor that is observed and measured in a

n experiment? A. control group B. experimental group C. dependent variable D. independent variable
Biology
2 answers:
Ksju [112]2 years ago
5 0

The correct answer is: dependent variable.

There are two main variables in an experiment: the independent and dependent variable.

The experimenter changes the independent variable and that has the influence on dependent variable. So, the effect on the dependent variable is tested (observed and recorded).


aniked [119]2 years ago
5 0

Answer: Dependent variable

Explanation:

The whole experiment depends on both the factors independent variable and dependent variable.

The independent variable can be changed according to the experiment. The change in independent variable affects the result of the experiment.

The factor that is observed during the experiment is known as dependent variable. This changes as we change the independent variable.

Hence, the correct answer is option c

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Muscular exercise presents a dramatic test of the body's homeostatic control systems because it results in large _____.
kicyunya [14]

Muscular exercise presents a dramatic test of the body's homeostatic control systems because it results in large amounts of heat production.

Homeostatic control systems- A body's physiological ability to maintain a steady internal environment in response to changes in the external environment is known as homeostasis.

Heat Production- The term "thermogenesis" refers to the process through which energy is lost by producing heat with specialization.

Energy- In biology, cells frequently store energy in macromolecules, especially lipids and carbohydrates (sugars). When chemical bonds are formed, such as during the redox reactions of cellular aerobic respiration, energy is released.

Redox Reactions- A reaction that happens when an oxidizing material and a reducing substance come into contact.

To know more about the homeostatic control system, click on the below link,

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7 0
2 years ago
Which of the following is continually passed from one enzyme to the next during the Electron Transport Chain?
AVprozaik [17]

The correct answer is electrons.  

Electron transport chain refers to an array of complexes, which mediates electrons from electron donors to electron acceptors through redox reactions, and combines the transfer of electrons with the transfer of protons through a membrane.  

This produces an electrochemical proton gradient, which instigates the production of ATP. The ultimate electron acceptor in the electron transport chain is oxygen in aerobic respiration and sulfate in anaerobic respiration.  


5 0
3 years ago
Birds are the main predators of these beetles; they hunt the beetles by sight and pick them off the tree bark where they feed. A
Alinara [238K]

Complete question:

1. The graph below depicts the frequency of expression of the coloration of beetles on an island:

Graph is the 1st Pic --> Attached files    

Birds are the main predators of these beetles; they hunt the beetles by sight and pick them up off of the tree bark where they feed. A logging company clears the trees off of the island and plants younger trees as a replacement. Trees with light bark are planted on one side of the island and trees with dark bark are planted on the other side of the island. What do you predict would happen to the range of coloration in the populations of beetles on each side of the island?

Select TWO answers, one to represent the beetles living on the light colored trees and one to represent the beetles living on the dark colored trees. (2 points)

A. graph 2 below

B. graph 3 below

C. graph 4 below

D. graph 5 below

Answer:

B. graph 3 below

D. graph 5 below

Explanation:

The original population of beetles (Graph 1) shows that most individuals had an intermediate phenotype between dark and light color. The graph expresses its highest point in the middle of the phenotypic ax, while the curve´s tails coincide with light and dark colors.

Probably, most of the trees inhabiting the whole island had some darkish color tone, which beetles used to camouflage and avoid predation.

When the company cleared the area and reforested, they planted light trees on one half and dark trees on the other half of the island. This change in the environment modeled the beetled phenotype, together with predation pressure.

<em>If we consider the whole original population, we should say that it went under a disruptive selection.</em> But if we think about the sides of the island separately, we could say that the population living on each side went under directional selection. We are not thinking about the whole population of beetled inhabiting the whole island, but two groups inhabiting each side of the island.

  • Graph 3 represents the beetles inhabiting the part of the land with dark trees. The population went under directional selection, and most of them turned into dark-colored to camouflage with the substrate in which they live.
  • Graph 5 represents the beetles inhabiting the other part of the land with light trees. The population went under directional selection, and most of them became light-colored to camouflage with the substrate in which they live.

8 0
3 years ago
What is the difference between a true rib.a false rib and a floating rib
ivann1987 [24]

True rib : the first seven ribs attach to the sternum (the breast bone) in the front and are known as true ribs (or sternal ribs)

False ribs: the lower five ribs do not directly connect to the sternum and are known as false ribs  

Floating ribs :The floating ribs are less stable and risk breaking because they have only one attachment  

Dorsally to the vertebrae and have very thin bone tissue locked in muscle as they extend  

Laterally.


8 0
2 years ago
Read 2 more answers
What are three main sources of genetic variation in organisms?
Readme [11.4K]
1- Mutation

2- Gene Flow

3- Sexual reproduction

Hope this helps :-)
7 0
3 years ago
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