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Okay the answer is C. Adapted to high-oxygen levels.
They are accepted as true until they are proven false. Once a theory has been tested and it is wrong, then it is no longer true.
The red tides are caused because of the algal blooms, which discolor the ocean's water. These tides are red because of the presence of the pigments known as phycobilin. The blue phycocynin and red phycoerythrin contributes to the red color of these tides. The chlorophyll a contained in most of these algae are seen only when the algal blooms although at other times they are still present but deep in the ocean where they cannot be seen.
The green tides will be produced when the green algae, chlorophyta, blooms. These algae obtain energy from the sun for photosynthesis.
10 km = 10 × 1000 m = 10 000 m
10 000 m = 10 000 × 1000 mm = 10 000 000 mm
