What do mucus, saliva, and tears have in common? a. they contain chemicals that attack pathogens b they contain vaccines against pathogens c. they are made of lymph d. they contain only water

Agene in a type of bacteria when the ses bacteria reproduce asexually this mutation can only be inherited by

Which level of consumer had access to the smallest apply of energy

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.