Many songbirds breed in north america in the spring and summer and then migrate to central and south america in the fall. they spend the winter in these warmer areas, where they feed and prepare for the spring migration north and another breeding season. two hypothetical species of sparrow, a and b, overwinter together in mixed flocks in costa rica. in spring, species a goes to the east coast of north america, and species b goes to the west coast. what can you say about the isolating mechanisms of these two species?

a. one of the species is probably polyploid, so they are reproductively isolated by genetic incompatibility.

b. reinforcement must be occurring when they winter together.

c. the two species do not breed in the same area, so they are reproductively isolated by allopatry.

d. they must have strong prezygotic or postzygotic isolating mechanisms in order to spend winter in such close proximity.

Getting rid of my account might as well do it with some fun make sure to read all of this it is hilarious a plane was about to crash and there were 5 people on board and only 4 parachutes. the first person said: " i am roy keane, one of the best footballers in ireland. i am worth a lot of money and my fans need me so i think i should be saved." the others agreed and gave him one of the parachutes and off he went. the second person said: "i am gerry adams, a radical irish politician who can really my country and i think i should be saved." the others said: "o.k.", and gave him a parachute. the third person said: "i am george bush, president of the most powerful country in the world. everyone knows i am a really nice guy and everyone thinks i am stupid,but i'm not, so i am taking a parachute." and off he went. there were two people left, the pope and a 10 year old schoolgirl. the pope said: "child, i am old and frail and have lived my life while you are young, with everything before you. you take the parachute and i will stay with the aircraft and take my chance." "it's o.k." said the girl, "there are still two bush picked up my schoolbag."

Surrounded by microtubules, located near the nucleus. (don't try to google it) (give answer only if u know)

What controls activities within a eukaryotic cell?