What is the most effective method of birth control?
a.
withdrawal
b.
abstinence
c.
diaphragm
d.
iud

select the best answer from the choices provided.

a
b
c
d

How many calories are in one pound of fat

What can you do to be a financially responsible consumer.

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.