The atmosphere is a dynamic system, meaning it changes continuously. It is affected by A) sunlight
B) carbon dioxide
C) Oxygen
D) human activities
E) all of the above

All of the above is what it should be

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.