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Chlorella algae's environment is its culture medium. So, if a certain element is absent from the culture medium, the algae won't be able to efficiently build molecules that contain that element.

Chlorella algae's environment is its culture medium. So, if a certain element is absent from the culture medium, the algae won't be able to efficiently build molecules that contain that element. xaQ2Q
Organisms use the elements available in their environments to build biological molecules. In this case, the Chlorella algae's environment is its culture medium. So, if a certain element is absent from the culture medium, the algae won't be able to efficiently build molecules that contain that element. According to the graph, the rate of synthesis for lipids and carbohydrates didn’t change over the 3-week period, but the rate of synthesis for proteins and nucleic acids decreased. These results indicate that the culture medium contained all of the elements required for building lipids and carbohydrates, but not for building proteins and nucleic acids. Many lipids contain phosphorus, so it’s unlikely that phosphates (a source of phosphorus) were missing from the culture medium. However, both proteins and nucleic acids contain nitrogen, while lipids and carbohydrates do not. So, it’s likely that the culture medium lacked nitrogen-containing compounds.
Organisms
This phrase/word (depending on the context) can be potentially replaced with :
use
the elements available in their environments to build biological molecules.
In this case
, the Chlorella algae's environment is its
You use this word too often, consider replacing it with
culture
You use this word too often, consider replacing it with
medium
.
This phrase/word is too simple and can be replaced with:
So
, if a certain element is absent from the
You use this word too often, consider replacing it with
culture
You use this word too often, consider replacing it with
medium
, the algae won't be able to
efficiently
build molecules that contain that element.

According to the graph, the rate of synthesis for lipids and carbohydrates didn’t
This phrase/word (depending on the context) can be potentially replaced with :
change
over the 3-week period,
This phrase/word is too simple and can be replaced with:
but
the rate of synthesis for proteins and nucleic acids decreased. These results indicate that the
You use this word too often, consider replacing it with
culture
You use this word too often, consider replacing it with
medium
contained
Consider using "all the".
all of the
elements required for building lipids and carbohydrates,
This phrase/word is too simple and can be replaced with:
but
not for building proteins and nucleic acids.

This phrase/word is too simple and can be replaced with:
Many
lipids contain phosphorus,
This phrase/word is too simple and can be replaced with:
so
it’s unlikely that phosphates (a source of phosphorus) were missing from the
You use this word too often, consider replacing it with
culture
You use this word too often, consider replacing it with
medium
.
However
, both proteins and nucleic acids contain nitrogen, while lipids and carbohydrates do not.
This phrase/word is too simple and can be replaced with:
So
, it’s likely that the
You use this word too often, consider replacing it with
culture
You use this word too often, consider replacing it with
medium
lacked nitrogen-containing compounds.
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IELTS academic Chlorella algae's environment is its culture medium. So, if a certain element is absent from the culture medium, the algae won't be able to efficiently build molecules that contain that element.

Academic
  American English
3 paragraphs
145 words
This writing has been penalized,
text can't be
less than 250 words in Task 2
and less than 150 words in Task 1
5.0
Overall Band Score
Coherence and Cohesion: 7.0
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Lexical Resource: 5.5
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Grammatical Range: 6.0
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Task Achievement: 6.5
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