Cyanobacteria use the process of
to produce energy, and oxygen is given off as a waste product.

Photosynthesis utilizes water as an electron donor in cyanobacteria in general and creates oxygen as a by-product, although some can even use hydrogen sulfide, a process that occurs among other photosynthetic bacteria, such as purple sulfur bacteria. Carbon dioxide is reduced via the Calvin cycle to form carbohydrates.

away from the curb

explanation:

the wheels would then hit the curb if it started to rolling, decreasing the chance of an accident.