Most european nations have a dominant culture.
a. true
b. false

Veins have a much lower blood pressure than arteries. which of these prevents backflow of blood in veins? a. pressure applied by the heart b. one–way valves in veins c. thin muscular walls of veins

Which of the following is an abiotic factor in an ecosystem? a. bacteriab. airc. niched. grass(abiotic=non-living) me !

Modern sea star larvae resemble some primitive vertebrate larvae. this similarity may suggest that primitive vertebrates