Acylindrical blood vessel is partially blocked by the buildup of plaque. at one point, the plaque decreases the diameter of the vessel by 60%. the blood approaching the blocked portion has speed v0. 1) just as the blood enters the blocked portion of the vessel, the blood's velocity will

 It will slow down.

Explanation:  This is because the same amount of blood that usually goes through will have to fit through a blocked vessel.  Only a little will be able to go through at one time, causing the blood flow on the other side to slow.

(That is really dangerous.  The build-up will eventually burst the vessel)  Just an FYI

tsd is temerature dependent sex determination.

tsd: it is a type of environmental sex determination in which the temperature experienced during embryonic/ larval development (ambient temperature for development) determine the sex of the offspring.

crocodile displays the tsd where the ambient temperature of the developing egg determines the individual's sex. for example in the american alligator's eggs, incubation at 33 ºc produces mostly males, while incubation at 30 ºc produces mostly females. so if the american alligator's egg will get the ambient temperature (33 degree celcius)during embryonic development from egg, the offspring will be male and same for the female sex determination.