Lipids that are not essential in the diet but are used in the structure of every cell membrane. True or False

If a strand of dna has 35% thymine. what is the percentage of cytosine, adenine, guanine?

Which of the following statements about protists are true? a.they are typically found in moist environments. b.they are all unicellular. c.they have a nucleus. d.they are all multicellular.

Which of the following is a reason why early living organisms on earth could not have survived on the surface? 1. the lack of an ozone layer 2. the lack of oxygen in the atmosphere 3. the fact that these organisms were single-celled