An opening between the right and left atria that's present in fetal mammals is the a. ductus arteriosus. b. foramen ovale. c. umbilical fistula. d. portosystemic shunt.

Prior to the mt. st. helens eruption on may 18, 1980, satellite and topographic views of the volcano were captured. based on the topographic map of mt. st. helens, what is the contour interval if the volcano height is 2,950 m? question 9 options: 600 m 400 m 750 m 500 m

Amineral crystallizes from magma deep inside earth. which characteristics can be determined given only the information above. a) luster b) streak c) crystal size d) crystal structure

Do all toxic substances in the environment bioaccumulate