Which chemical equation represents a redox reaction?(1 point) 1.) Fe2O3(s) + 2Al(s) → Al2O3(s) + 2Fe(l)
2.) CaO(s) + SiO2(s) → CaSiO3(l)
3.) CaCO3(s) → CaO(s) + CO2(g)
4.) TiCl4(s) + 2H2O(g) → TiO2(s) + 4HCl(g)

PLEASE HELP!!!

Step 1 review the imaginary strand of dna below. note the complementary base pairs. a g c a a t c c g t c t t g g t c g t t a g g c a g a a c c step 2 to begin replicating this strand of dna, draw the two sides of the strand separating. step 3 now, draw the free-floating bases linking up with the separate sides. remember to follow the rules of complementary base pairing. step 4 draw the two resulting dna strands.

Anurse is caring for a 42-year-old client who is scheduled for an amniocentesis during the fifteenth week of gestation because of concerns regarding down syndrome. what other fetal problem does an examination of the amniotic fluid reveal at this time?

Apopulation follows a period of decline; overshoot increase; overshoot increase; scarcity scarcity; dieback