A biologist is using a dichotomous key to identify fish. 1. (a) Has a single dorsal fin ® 5 (b) Has a double dorsal fin ® 2 2. (
a) One fin is spiny, the other is smooth ® 3 (b) One fin is not spiny or smooth ® 4 5. (a) Has small fin on back near tail ® 6 (b) Has no fin on back near tail ® 7 6. (a) Has barbs near the mouth ® Catfish (b) Does not have barbs near the mouth ® 10 7. (a) Tail is asymmetrical ® 8 (b) Tail is symmetrical ® 9 10. (a) Scales are small ® Trout (b) Scales are large ® Whitefish What is the next step to take to identify a fish that has a single dorsal fin and no fin on the back near the tail? step 5 step 2 step 7 step 6 Mark this and return
When SA Node triggers Atria goes into Systole !! and when the signal reaches to AV node and from there it goes to Bundle of His making Ventricle to systole or constrict !!
