What could be the reason for the faster rate of decomposition in the tropics?

Match List-$I$ with List-$II$ :

List-$I$	List-$II$
$A$. Decomposition	$I$. Accumulation of dark coloured amorphous colloidal substance
$B$. Detritus	$II$. Release of inorganic nutrients by the activity of microbes in soil
$C$. Mineralisation	$III$. Breaking down of complex organic matter into inorganic substances
$D$. Humification	$IV$. Dead remains of plants and animals including fecal matter

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The slow rate of decomposition of fallen logs in nature is due to their

Most diverse organisms of an ecosystem are

Identify the correct statements:
$A.$ Detritivores perform fragmentation.
$B.$ The humus is further degraded by some microbes during mineralization.
$C.$ Water-soluble inorganic nutrients go down into the soil and get precipitated by a process called leaching.
$D.$ The detritus food chain begins with living organisms.
$E.$ Earthworms break down detritus into smaller particles by a process called catabolism.
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The rate of decomposition is controlled by .........