Which system is considered the bodys pleasure center ?

How do your peer relationships affect your overall health status? what can you do to improve your peer relationships?

Which term defines one's age as measured by how well the body is working? chronological age biological age social age mental age

Why do rna viruses appear to have higher rates of mutation? a) rna nucleotides are more unstable than dna nucleotides.b) replication of their genomes does not involve proofreading.c) rna viruses can incorporate a variety of nonstandard bases.d) rna viruses are more sensitive to mutagens.