What happens during implantation?

1. Sperm are deposited into the vagina.

2. The embryo is surrounded by the amniotic sac.

3. Sperm fertilize an egg.

4. The blastocyst attaches to the wall of the uterus.

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.

Who could you talk to if you were concerned about your own mental health or that of a loved one?

What are 6 levels of organization for anatomy and psychology