Many trees shed their leaves during the autumn months when conditions are not suitable for photosynthesis. which characteristic of living things is best represented when a tree sheds it leaves during the autumn? a)metabolismb)reproductionc)use of a genetic coded)response to external stimuli

The correct answer is option D) "response to external stimuli".

Explanation:

The phenomenon of tree shedding their leaves during the autumn months is an example of plants response to external stimuli. The deciduous trees start shedding their leaves when light levels and temperatures drop, as a result of the flow of auxin being reduced and the levels of the hormone ethylene rise in the leaves. This process allows the trees to survive winter by conserving resources and protecting from being blown by the winds.

cardiovascular system

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explanation:

b,bacteria convert nitrates

into nitrogen gas.

d,plants and animals take in

and use nitrogen compounds.

e,bacteria break down waste    

products and return nitrogen  

to the soil.

a,bacteria convert atmospheric

nitrogen to ammonia.

c,bacteria convert ammonia

to nitrites and nitrates.