The correct answer is: B. The water before filtration is a mixture because the particles could be physically separated.
A mixture is composed of more than one individual substances that can be separated using different methods (depending on the type of mixture). Methods for the separation include filtration, evaporation, distillation and chromatography. The dirt stays behind in the filter paper (it becomes the residue) andthe water passes through the filter paper (it becomes the filtrate).
Only the strongest animals survive
In a new environment colonization of the substrate occurs in sequence hence it is common to see growth in biodiversity of the new ecosystem with time. Ecological succession begins with pioneer plants in primary succession. These pioneer plants break down rocks to soil hence releasing bound nutrients and making them available to higher plants up in the succession line. Therefore, in the beginning, one will find plants such as mos, lichens and annual plants such as grasses. The biodiversity will increase to include shrubs, then plants like trees will eventually appear.
Well I would say white blood cells, saliva, and skin are three types of defenses against the bacteria.
