Which two organ systems regulate homeostasis in our bodies?
nervous and endocrine
cardiovascular and respiratory
nervous and cardiovascular

Which phase of the cell cycle ensures that identical copies of the dna are made for daughter cells?

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.

Why do some dna fragments move farther than others during gel electrophoresis? a. because their shapes are different b. because they are different types of molecules c. because the samples are different colors d. because their masses are different