What percentage of the total global carbon is contained in the atmosphere (in $, \%$)?

What is formed by the interaction between biotic communities and their environment?

$A$: Agriculture and aquaculture are man-maintained ecosystems.
$R$: All biotic and abiotic factors are managed by humans in these ecosystems.

Detritus food chain begins from . . . . . . .

The organisms,which attack dead animals are

The average price tag for ecosystem services has been placed at around $.........$ per year.