Mars is tilted on its axis. which is a result of this tilt? a. solar eclipses occur frequently on mars. b. mars has a short rotational period. c. there are seasons on mars. d. mars is always hot.

option a is correct i.e.

explanation:

in context to the membrane of nerve impulse, the outer membrane of neuron is semi permeable that is only sodium ions can pass through the membrane i.e. smaller ions can pass through the membrane while larger ions cannot pass through it.

answer; ///(b) it is composed of four protein chains and four heme groups;

your spelling is a little off : ]