The refractory period is.. i. an increase in the electrical gradient across a membrane ii. a period when the neuron is insensitive to depolarization iii. a decrease in the electrical gradient across a membrane a. ii only b. i and ii only c. i only d. i, ii, and iii e. iii only

{answer found. it's (3 ) }which statement describes the cell cycle? (1)the cell cycle is a process in which one cell divides into four genetically different cells. (2)the cell cycle is a process in which one cell divides into two genetically different cells. (3)the cell cycle is a process in which one cell divides into two genetically identical cells. (4)the cell cycle is a process in which one cell divides into four genetically identical cells.

Which best describes a gene? a. a sister chromatid b. a chromosome c. a tetrad d. a piece of a chromosome

Ecology can best be described as the study of what