The hydrolysis of GTP to GDP carried out by tubulin molecules a. allows the behavior of microtubules called dynamic instability. b. tips the balance in favor of microtubule assembly. c. provides the energy needed for tubulin to polymerize. d. occurs because the pool of free GDP has run out.

answer: the answer is b

he movement of air through earth's or any planet's atmosphere is called wind, and the main cause of earth's winds is uneven heating by the sun. this uneven heating causes changes of atmospheric pressure, and winds blow from regions with high pressure to those with low pressure.

i hope this : )

what bodys are there orbiting?