Roundworms are pseudocoelomic. this means that they have
a. organs, but no true body cavity.
b. a true body cavity, but no organs.
c. both organs and a true body cavity.
d. neither organs nor a true body cavity.

C. both organs and a true body cavity. An example of an organ is the intestine.

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.