Which of the following statements is false?
algae are used to make many commercial products, like marshmallows and paint.
algae can be used as fertilizer.
algae can be used to make a polishing substance.
algae contributes to the phosphorus cycle.

The correct answer would be Algae contributes to the phosphorus cycle.

Algae refer to the diverse group of non-flowering photosynthetic eukaryotic organisms which belong to the kingdom Protista.

They serve numerous commercial or industrial uses such as used as soil fertilizers, used in wastewater treatment, production of industrial products such as fuel, food, medicines, animal feed et cetera.

However, they are not used in the phosphorus cycle. Instead, soil bacteria help in breaking down organic compounds into the inorganic form of phosphorus in the soil.

weathering - colorado river carves land in arizona to form the grand canyon. cracks form in a sandstone wall surrounding a house. a marble statue near the science museum is changing color due to rainfall

erosion - after a rainstorm, soil and rock piees litter the roadways. the sand dunes in the sahara desert are changing shape.

here's your answer.