Which of the following are factors which shape marine ecosystems?
a) salinity of the water
b) temperature of the water
c) the amount of oxygen dissolved in the water
d) all of these

Which of the following statements about archaea and bacteria is true? a. neither is single-celled. b. they both have nuclear membranes. c. neither reproduces by binary fission. d. they both lack a nuclear membrane.

Sarah and john are having a discussion on genetic diversity. sarah believes that it happen over a long period of time. john it happens immediately. who is correct? a. sarah is correct because genetic diversity occurs over a long period of time. b. john is correct because genetic diversity occurs immediately. c. both are correct because genetic variation can occur or long period of time. d. neither are correct because genetic diversity occurs over any period of time

The pressurized plants and fungi mentioned in the video have some surprising similarities. what differences would you expect them to have?