Which of the following must unicellular organisms do to maintain homeostasis? a. change food or sunlight into useful energy b. use chemical signals to communicate between its cells c. organize cells into tissues d. specialize cells to perform specific functions

List five ways we are indebted to phytoplankton

Which of the following matches the organisms described with the correct domain? a. archaea--multicellular, eukaryotic organisms that do not have cell walls b. eukarya--single-celled and multicellular organisms, with a defined nucleus and a variety of nutritional sources c. bacteria--unicellular, eukaryotic organisms with cell walls that do not contain peptidoglycan d. bacteria--unicellular, eukaryotic organisms that always lack cell walls

What process creates gametes? a. fertilization b. mitosis c. meiosis