What are the four factors that lead to evolution?

In a cladogram' when does a group of organisms branch off

There are only about 250,000 known fossil species. true or false

Kidney stones are tiny crystals of calcium or magnesium that block the narrow sections of the excretory system. which symptoms would a person with kidney stones experience? a. inability to store urine; pain in the bladder b. inability to store urine; pain in the urethra c. reduced urine flow; pain in the bladder d. reduced urine flow; pain in the urethra