the steps of the action potential are listed below.

a. the nerve impulse moves down the axon.
b. the inside of the membrane becomes positive, and the outside becomes negative.
c. a stimulus is received by the dendrites.
d. the membrane has a resting potential that is positive on the outside and negative on the inside.

which of the following lists the steps in the correct order?
1)a, b, c, d
2)d, c, b, a
3)b, c, a, d
4)d, a, b, c

During crossing-over, a. genetic material is exchanged between nonsister chromatids, resulting in new combinations of alleles. b. nonsister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles. c. one homologous chromosome of a tetrad is exchanged with another tetrad, resulting in new combinations of alleles. d. sister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles. e. genetic material is exchanged between sister chromatids, resulting in new combinations of alleles.

According to cell theory; which structures carry out the basic function of living things? a. atoms b. organs c. cells b. nuclei

Are humans interfering with or a part of evolution happening today? find examples of evolution seen in recent history that could be caused by human activity.