The Aristidoideae subfamily of grasses inhabits arid regions and respire using the C4 photosynthetic pathway. A related grass, Axonopus compressus, grows in moist, shaded environments and photosynthesizes using the more common C3 photosynthetic pathway. What is a possible explanation for the difference in respiration?

The grasses coevolved different respiratory mechanisms of the same species in different environments.
The grasses evolved as a result of biotic stresses.
The grasses evolved different respiratory methods to adapt to the differences in water availability of their environments.
The grasses evolved similar respiratory methods due to their common cellular structures.

Question

The Aristidoideae subfamily of grasses inhabits arid regions and respire using the C4 photosynthetic pathway. A related grass, Axonopus compressus, grows in moist, shaded environments and photosynthesizes using the more common C3 photosynthetic pathway. What is a possible explanation for the difference in respiration?

The grasses coevolved different respiratory mechanisms of the same species in different environments.
	The grasses evolved as a result of biotic stresses.
	The grasses evolved different respiratory methods to adapt to the differences in water availability of their environments.
	The grasses evolved similar respiratory methods due to their common cellular structures.

anonymous · Answer

what do you think?

anonymous · Answer

i think it would be C.  the different water availability of water because thats the biggest difference in their environments @shifuyanli