organism that lives in or on another organism and benefits by deriving nutrients at other's expense. Organisms that lives and feeds on diff organism.

of or found in salt water. Water containing salts such as the ocean.

small flow of liquid. To flow in a thin slow stream.

Building or tank for keeping fish and water plants.

arrange to receive something regularly by paying in advance.

empty bottle or glass. Items e.g. a bottle whose contents have been used. To remove the contents from, e.g. dishwasher.

Group of molecules made from amino acids.

referring to signals/information represented by discrete values of quantity.

of size that is less than normal or usual.

Waste material that has been thrown out.

Using or concerning machines. working parts of vehicle.

continuing or valid to final destination. From the beginning of something until the end. By a particular way or process; by the use of.

action or process of filtering something.

Not yet eaten.