What kind of unhealthful air population occurs when ozone near the ground mixes with other polluting gasses

In the diagram below, the northern hemisphere would be in what season at position a a.fall b. winter c.summer d.spring

Explain the source of radioactivity in uranium in earth’s crust by which it produces nuclear radiation

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.