Can some one help me on these last two questions? please?

Which statement is true about the cell theory? a) it is well-supported by evidence. b) it is unchangeable and permanent.

Which statement describes characteristics of planarians? a they live in oceans, are parasites, and reproduce only sexually. b they live in fresh water, are parasites, and reproduce only asexually. c they live in oceans, are free living, and reproduce sexually and asexually. d they live in fresh water, are free living, and reproduce sexually and asexually.

How are fossils most commonly formed