What is the leading cause of death of children under the age of 1 year?

When studying heredity, what is the relationship of dna based and traits? super urgent !

Which two levels of the spine that can undergo flexion and extension?

Which of the following processes within viral replication is the greatest source of genetic variation in rna virus populations? a) high mutation rate due to lack of proofreading of rna genome replication errors.b) transcription from the host cell rna polymerase introduces numerous mutations.c) capsid proteins from the host cell can replace the viral capsid.d) viral rna is translated by host cell ribosomes.