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3 years ago

What is the most difficult part of a controlled experiment?

Biology

2 answers:

siniylev [52]3 years ago

8 0

Answer:

The correct answer is option 1.) "testing only one variable".

Explanation:

One of the basis of scientific experimentation is to test one variable at the time in order to make sure that the obtained results are a direct consequence of the variable of study. However, testing only one variable at the time is not an easy task. It is necessary to establish a negative control which only difference is the absence of the variable, and a positive control using a variable that the scientist know is going to produce a response.

Anna71 [15]3 years ago

4 0

1. Testing only one variable
A controlled variable means its the one that stays the same. In a controlled experiment, it means there is only one manipulated, (changed) variable.

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If all living things are related then where did all their differences come from?

stiks02 [169]

Answer:

Hox Gene

Explanation:

First, you're question is very vital, there are many ways in classifying along with identifying all living organisms that includes; morphological analysis, molecular systematics (studying the similarities and differences of the genetic data such in the sequences of DNA, RNA, and rRNA ), homology, cladistics, etc. based on phylogenetic tree, which the study of the evolutionary among various species.

But through it said that all living organisms shared one common ancestor. However, what makes them different from one to another is the homeotic genes that called Hox Genes; which specify the fate of a particular segment or region of the body, meaning the number and arrangements of the Hox genes varies considerably among different types of animals.

For instance, Sponges have at least one homologous to Hox genes, also insects have nine or more Hox genes resulting in multiple Hox genes occur in a cluster in which the genes are close to each other along a chromosome. Therefore, increases in the number of Hox genes have been instrumental in the evolution of many animals species with greater complexity in body structure.

Overall, more Hox genes, more complexity in body structure resulting in the differences of their morphological structure.

Hope that answered your question!

7 0

3 years ago

You are designing an experiment to determine whether plants grow faster with or without water. Which should be varied in order t

Dafna1 [17]

C. Because I just took the the test

4 0

3 years ago

One reason that regulation of gene expression is important is that it saves energy and materials from being used when they are n

lara [203]

Answer:

d. transcriptional regulation (regulation of whether transcription occurs)

Explanation:

If the product of a gene is not needed, then allowing the transcription of such gene to proceed only to be regulated after or even after translation will result in a mere wastage of resources. It thus means that the resources utilized for transcription has been wasted.

Hence, the correct option is d.

5 0

3 years ago

Please answer this for me

8090 [49]

Answer:

Im pretty sure its A the phagocytes.

Explanation:

6 0

2 years ago

Primary source of energy for earth's weather systems

harina [27]

The sun.
I hope this helped

4 0

3 years ago