Answer: B
Explanation: They are extremely stable types of atoms
The percentage that is homozygous recessive is .3^2=.09
The nephron itself does not connect to the ureters
renal corpuscle ⇒ proximal convoluted tubule ⇒ nephron loop ⇒ Distal convoluted tubule ⇒ collecting duct ⇒ papillary duct ⇒ minor calyx - major calyx (union of minor calyces) - renal papilla (union of major calyces) ⇒ renal pelvis ⇒ ureter