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.

i think the answer would d

instead of copying and pasting things off of tests or work done on computer which im sure you did, try and read over the question carefully

the wetland preservation movement began in the u.s. in earnest with the clean water act (cwa) of 1972. although not specifically written to protect wetlands, the cwa is comprised of a series of regulations designed to prevent pollutants from contaminating u.s. waters.