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Okay I have no idea how to solve this question and I really need help on it: Ann, Brian, Diane, and Eric go to watch a movie and sit in 5 adjacent seats. In how many ways can this be done if: (a) Brian sits next to Diane, and (b) Brian refuses to sit next to Diane?

a. lack of faith in collective security b. plan for its future invasion of Germany c. claim to sphere of influence d. opposition to German reparations payments I think that it's "a" but I wanted to make sure that I'm right.

population size and growth rate.? a. density independent b. extrinsic c. none of these d. abiotic e. all of these I think it's "A" am I right?

..._____.? A. all organisms B. all predators C. soil, water, and weather D. all organisms, soil, water, and weather I think it's "C" am I right?

indicates the start of what? Out of these which would it be and could you give an explanation of why?: primary succession, intraspecific competition, resource partitioning, or environmental resistance

...____ will not occur.? A. gene flow B. random mating C. natural selection D. genetic mutations I think it's "A" am I right?

...(multiple choice)? a. Pharaoh b. The High Priest of Amun c. The Commander of Pharaoh's Guard d. The Vizier e. The Regent

Here's the equation: Zn(s) + 2HCl(aq) -> H2(g) + ZnCl2(aq) Can you explain how to do it?

Here's the equation: 2Al(NO3)3(aq) + 3Na2CO3(aq) -> Al2(CO3)3(s) + 6NaNO3(aq) Could someone explain how to write the complete ionic form and net-ionic form of this equation?