A "salmon shoot" is A path that allows migrating salmon to swim around a dam.
B. Like a water slide that transports salmon over a dam.
C The buildup of sediment along the bottom of a reservoir.
D barrier that blocks salmon from migrating up river to spawn.

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B

The 'salmon cannon' created by Whooshh Industries transports salmon over treacherous waters in a matter of seconds  

The innovation is crucial for helping salmon get upstream to spawning grounds

relative dating involves things like higher layers are most recent than rocks lower in the sequence. this can be extended to the known sequence of fossils. rocks containing rabbit fossils are later than those containing dinosaur fossils.  

absolute dating methods mainly use radioactive elements that have known rates of decay and produce recognizable products. for example potassium 40 decays to produce argon. once a rock has solidified the argon is trapped. by measuring the argon and potassium0 you can get an accurate number for the age.  

some other methods are good for archaeological ages. dendrochronology involves recognizing the sequence of tree rings. the orientation of magnetized particles in baked clay can be used to date a fire.

hope this .. .

1. is geographic distribution

2 is increasing complexity

3 is transitional forms