Ineed urgently on these questions! plz !

Areal dna molecule consists of thousands of these pairs of nucleotides. what is the pairing arrangement of the nitrogen bases

Scientists discover two populations of mice on either side of a major river. the two populations have almost identical genes but the mice from one side cannot breed with mice from the other. this is most likely because

Which of the following types of stars are dim but can have high surface temperatures? giants main sequence stars supergiants dwarfs