Answer:
Right here! Everyone is amazing, gay or not!
Explanation:
Answer:
B. atrioventricular (AV) valve
Explanation:
The function of the conduction system of the heart is to spread the electric signal and make the heart contract in coordinated timing. Conduction starts at SA node, then the AV node then will spread by bundle branches.
The atrioventricular valve is not part of the conduction system. The valve function is to keep the blood flow back. If the valve is broken and blood did flow back, it can make the heart need to do more work than usual.
(Variation.)Heritable differences that exist in every population are the basis for natural selection.
(Overproduction). Competition between offsprings for resources.
(Adaptation.) a trait that helps an organism survive and reproduce.
Descent with Modification.
That would be the DNA Helicase unzipping and rezipping genes
