Question

why are algae and ferns both green?
they each contain chlorophyll that absorbs violet - blue light and reflects green light.
they each contain chlorophyll that absorbs green light and reflects violet - blue light.
algae contain chlorophyll, and ferns contain ferredoxin that absorbs violet - blue light and reflects green light.
ferns contain chlorophyll, and algae contain ferredoxin that absorbs green light and reflects violet - blue light.

Explanation:

Chlorophyll is a pigment found in both algae and ferns. Chlorophyll absorbs violet - blue light (which has a high energy content suitable for photosynthesis) and reflects green light. This reflection of green light is what gives these organisms their green color. Ferredoxin is an electron - transfer protein and not a pigment that gives color. So, the correct reason for both algae and ferns being green is related to chlorophyll's light - absorption and reflection properties.

Answer:

They each contain chlorophyll that absorbs violet - blue light and reflects green light.