What scientists studies biotic factors? ?

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 can an organ, such as the lungs, work for multiple body systems?

What is the correct order of cell division? include what happens in each phase