Its important to know that science is:

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.

Which sets of mrna codons could genetically come for a protein with the following amino acid composition