Which of these is most likely to result if biodiversity is lost in an ecosystem? A. An increase in the ecosystem's resilience to change
B. A decrease in the selective pressures on the remaining species
C. A loss of natural food sources
D. A gain of potential sources of medicines

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 statement correctly describes other ways in which nebulae and stars are different? a. a star always has a higher density than a nebula. b. stars can form inside a nebula but a nebula can never be produced by any star. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star. reset submit

This is an active transport mechanism by which cells pump sodium and potassium ions against the concentration gradient