Essential oils are natural, chemical-free alternatives to store-bought bug sprays. Many essential oils are mosquito repellents. Lemongrass and Citronella are the most commonly used in natural bug sprays, but most lemon-scented essential oils are insecticides. Other good options include Eucalyptus and Lavender.
1 Phytoplankton: photosynthetic plankton that are usually microscopic and are also called âalgae... 2  more. 3  Zooplankton: small, sometimes microscopic animals that live in water and feed on phytoplankton (algae), other zooplankton, or detritus (dead material)...4  more.here are bacteria that decompose, or break down, dead organisms and animal waste in the water. There are also photosynthetic bacteria that use the sunâs energy to turn carbon dioxide into sugars. These are called cyanobacteria, and theyâre a type of phytoplankton. Other kinds of phytoplankton, though, are eukaryotes.
Approximately 30,000 species make up this Subphylum. Most are aquatic; of these, the majority are marine but some are found in fresh water. Members of the Subphylum include lobsters, crabs, crayfish, shrimp, copepods, barnacles, and several other groups of organisms.ost use their maxillae and mandibles to take in food. The walking legs, including specialized chelipeds, may be used to help capture prey. Some crustaceans filter tiny plankton or even bacteria from the water; others are active predators; while still others scavenge nutrients from detritus.