Pahoehoe is

a.
cooler, slower-moving lava.
b.
fast-moving, hot lava.
c.
volcanic ash.
d.
lava with a rough, chunky surface.

The pahoehoe flow has a comparatively smooth or "ropy" surface. The surface of the aa flow consists of free chunks of very angular pieces of lava. This difference in form reflects flow dynamics. Aa forms when lava flows rapidly.

An enzyme in photosystem II splits water into hydrogen and oxygen. ... An enzyme called ATP synthase uses that potential energy to synthesize a molecule called ATP, which is the most common energy currency for cells, and which is used in the dark reactions of photosynthesis.

Explanation:

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