The movement of a substrate from an area of lie concentration to an area of high concentration is called a. osmosis b. diffusion c. passive transport d. active transport

The movement of a substrate from an area of lie concentration to an area of high concentration is called osmosis.

An autotrophic protist - they can perform photosynthesis and mainly consist of unicellular algae. they can be divided into number of systematic group according to the shape of their cell and the type of photosynthetic pigments they use.