The image below shows the results of a study on the types of animals found along a stretch of stream near to a factory. Which animal will live in the most polluted water?

A : Shrimp

B : Sludge worm

C : Leech

D : Snail

c.) polymerase chain reaction

- "unlike the original dna fingerprinting method, dna profiling does not use restriction enzymes to cut the dna. instead it uses the polymerase chain reaction (pcr)? to produce many copies of specific str sequences. pcr is an automated procedure that generates lots of copies of a specific sequence of dna."

the answer is; comparing the frequency of collisions with and without the device

this makes the anti-collision system an independent variable and the collisions a dependent variable. if there are fewer collisions with an anti-collision system that without, then it can be stated that the system is a success. essentially, collisions under an anti-collision system are compared with the frequency of collisions by cars with the human drivers.

x would be the most and the least would be y because there are more fruit   and seeds than flock z has insects

the answer is b. glad to .