The relationship between small insects called aphids and ants is called

Variety of living organisms; includes genetic, species, and ecological types.

Why do we perceive objects as retaining their brightness under different lighting levels?

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.