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in general, how do veins differ in structure from capillaries and arteries?

a. veins have more smooth muscle tissue than arteries and capillaries.
b. veins appear rounder in a cross section than arteries and capillaries.
c. veins have valves which are absent in arteries and capillaries.
d. veins have thinner inner walls than arteries and capillaries

D. Arteries are the main branches and veins are smaller and thinner to transport blood to other parts of the body that arteries aren't

Yeah, the answer is definitely b.assuming that you're a high school student or middle school student, you probably don't need your parents' to pick out your clothes anymore. and i don't know how it works at other schools, but i know that at my high school, you don't get to pick the book you read for an english assignment. your teacher picks that. the decision of what after-school job i should get, i would definitely make with from my parents and other people that i trust. ultimately, the decision is up to me, but i would need advice from people who are more experienced.