1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
antiseptic1488 [7]
3 years ago
9

A controlled experiment___. A. Includes one group for which the scientist controls all variables. B. Includes at least two group

s, one of which does not receive the experimental treatment. C. Includes at least two groups, one differing from the other by two or more variables. D. Is repeated many times to ensure that the results are accurate.
Biology
1 answer:
notsponge [240]3 years ago
5 0

Answer:

The correct answer is:

Includes at least two groups, one of which does not receive the experimental treatment. (B)

Explanation:

A controlled experiment is made up of at least two groups of participants (subjects). One group (the test group) receives the experimental treatment, which can be an intervention or a new drug to be tested etc, and the effect of the treatment on the subjects is measured, while the second group of similar subjects also known as the control group acts as a baseline and do not receive the treatment or intervention. They act as a baseline to ensure that the change observed in the treatment group was brought about as a result of the treatment.

<em>Note that repeating the experiment several times does not ensure accuracy of the result, rather it ensures reliability of the results hence option D is not correct</em>

You might be interested in
This is kinda a stupid question but do grassland biomes have hills?
nevsk [136]
<span>A grassland is a biome having predominantly grasses, and some woody shrubs, instead of trees and forests. So, Yes they do.</span>
4 0
3 years ago
Read 2 more answers
Where do you think trees take in carbon dioxide?
docker41 [41]
Trees take in carbon dioxide to build their tissues , which releases oxygen for us in the process.
6 0
3 years ago
Read 2 more answers
The phenotype of an organism is its physical characteristics, which result from the organsism's genes.
FromTheMoon [43]
What is the question ??

The term "phenotype" refers to the observable physical properties of an organism; these include the organism's appearance, development, and behavior. An organism's phenotype is determined by its genotype, which is the set of genes the organism carries, as well as by environmental influences upon these genes.
4 0
3 years ago
When was the first time a scientist has used fruit flies to study DNA?
Nitella [24]

Answer:

I think it was Thomas Hunt Morgan

8 0
3 years ago
Plant life first appeared on land during which of the following periods?
marusya05 [52]

The correct answer is B. Ordovician period

Explanation:

Plants are mainly multicellular organism that depends mainly on photosynthesis to obtain energy, this includes a wide variety of species such as grass, flowering plants, trees, shrubs, etc. Additionally, plants are considered as one f the two major divisions or kingdoms along with animals. In terms of history, it has been determined first land plants appear during the mid-Ordovician period around 470 million ago, although organisms that were the origin of land plants developed in water in previous periods, also by the Devonian period a wide variety of plants have emerged with features that are still part of plants nowadays. Therefore, plant life first appeared on land during the Ordovician period.

3 0
3 years ago
Other questions:
  • Why is active transport necessary for the sodium-potassium pump to work?
    5·2 answers
  • Why are fresh vegetables sprinkled with water ay market
    7·1 answer
  • Scientists can track the movement of proteins through the endomembrane system using an approach known as a pulse-chase experimen
    13·1 answer
  • Which of the following most accurately describes what can be seen in the fossil record? A. The fossil record shows every organis
    8·1 answer
  • The diagram to the right represents the lysogenic cycle. What is occurring at step D? The provirus is created. The provirus is r
    10·2 answers
  • Use Punnett square to predict the outcomes for the following crosses:
    15·2 answers
  • Although restriction enzymes are quite efficient at digestion of foreign DNA, they are prevented from acting on the DNA of host
    5·1 answer
  • 13. If a stream or river stops flowing due to water scarcity, what disease may result from the stagnant water?
    12·2 answers
  • NEED HELP ASAP‼️‼️‼️‼️ I WILL CASH APP YOU 10$ if correct Help ‼️
    5·1 answer
  • Submit this form. Not you? Switch account
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!