When does a recessive allele give a plant a recessive trait

What word is used to describe differences of individual organisms

Why should the united state be concerned about air pollution in china?

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.