Which season is occuring in the southern hemisphere when earthś northern hemisphere is tilted away from the sun

Why is it important to reduce the number of chromosomes in half when forming gametes for sexual reproduction?

Why reason best illustrates why hershey and chase chose to use viruses in their experiment?

Cold case files recently began re-investigating an old murder case. the murder took place in the park; a young man, james, was hit over the head with a brick and killed. police suspected the jealous former boyfriend of james' wife, karen. whoever killed james may have washed their hands in a near-by bird bath as detectives found blood in the bird bath. since the murder took place before dna fingerprinting was available, the suspected killer, ronnie, went free. detectives are now reviewing the blood evidence using dna fingerprinting. based on the dna fingerprints of all possible suspects, who is james' killer?