Carpenter Bee. In the late-spring and early summer, homeowners often notice large, black bees hovering around the outside of their homes. These are probably carpenter bees searching for mates and favorable sites to construct their nests. Male carpenter bees are quite aggressive, often hovering in front of people who are around the nests. The males are quite harmless, however, since they lack stingers.
The urinary system, also known as the renal system, consists of the kidneys, ureters, bladder, and the urethra. Each kidney consists of millions of functional units called nephrons.he urinary system, also known as the renal system, consists of the kidneys, ureters, bladder, and the urethra. Each kidney consists of millions of functional units called nephrons.
Function of Nephron. The nephron is the basic functional and structural unit found in the kidneys. Its main functions include regulating the concentration of sodium salts and water by filtering the kidneyâs blood, excreting any excess in the urine and reabsorbing the necessary amounts.