Cryptic crossword clue
Environmental systems said to credit concerns about cows’ regular expulsions 10

The most common and most likely answer to this crossword clue is the 10 letter word BIOSPHERES

B
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O
S
P
H
E
R
E
S

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The cryptic/wordplay part
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This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
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What does BIOSPHERES mean?

BIOSPHERES noun
  1. The part of the Earth and its atmosphere capable of supporting life.
  2. The totality of living organisms and their environment.

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