This might be easy but i dont know

Classify the structures as homologous or analogous, depending on their structure and function.

Nephrons, the functional unit of kidneys, are responsible for formation of urine. the sentences describe situations that are the result of problems in the urine formation process. for the nephron shown below, match each situation to the step in the urine formation process where the problem lies.

What is the one part of the nucleotide  that differs among the other different nucle  tides?