What are effects of sunlight on the aquatic life inhabiting atlantic ocean

Isolated volcanic peaks on the ocean floor are

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.

Natural selection changes allele frequencies because some survive and reproduce more successfully than others.