Best Answer: Slugs: Slugs have important ecological roles. They help cycle organic matter, which in turns helps to build healthy, rich soil. They also are food for wildlife, including raccoons, possums, garter snakes, toads, turtles, and birds. Snails: Just like slugs, snails help break down organic matter.
Facultative anaerobe. Definition. noun. An organism which is capable of producing energy through aerobic respiration and then switching back to anaerobic respiration depending on the amounts of oxygen and fermentable material in the environment. Supplement.rganisms in the Kingdom Fungi can also be facultative anaerobic, such as yeasts. Word origin: an-from Gk., not, without, + Greek Äero -, from ÄÄr, air. Compare: obligate anaerobe. See also: facultative anaerobe, microaerophile, aerotolerant.
Facultative heterochromatin is the result of genes that are silenced through a mechanism such as histone deacetylation or piRNA through RNAi. It is not repetitive and shares the compact structure of constitutive heterochromatin.