What type of transport takes place when a protein allows an ion to enter a
cell, but no additional energy is needed to make this happen?
A. Endocytosis
B. Active
C. Facilitated
D. Osmosis

Which plains area lies in both the united states and canada? altiplano central canadian shield coastal plains great plains

Which represents the cross between parent plants if one is heterozygous for yellow-colored pods and the other is homozygous for green-colored pods? yy  ´    ´    ´    ´  yy

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