The variety of skin tones present in the world demonstrates ________________.

The washing steps are necessary to _______.

Unlike skeletal muscle action potentials, cardiac muscle action potentials __________.

About ___________ babies born to mothers over 40 have ________.

According to this figure, the amphibians are a _____ group.

After a human sperm penetrates an egg, a fertilization envelope forms. this membrane _____.

Transcription is similar to dna replication in that ___________________.

Topoisomerase works to ______.

There should be a strong positive correlation between the rate of protein synthesis and _____.

The vertebrate spinal cord develops from the embryonic _____.

Viruses can vary with respect to all of the following characteristics except __________.