What would the relationship be between grass and a hawk?

They both can be found in the same food chain, but they aren't directly related. A hawk is a tertiary consumer (top of the food chain) and grass is a producer (bottom of the food chain). The hawks survival depends on grass:

Grass feeds on nutrients from the ground → insects eat grass and flowes → bigger insects eat the smaller insects → field rats eat the insects → hawks eat the field rats.

Hope it helped,

BioTeacher101

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."