Answer:
2.1 located between the left atrium and the left ventricle (left atrioventricular orifice).
2.2 it helps to prevent blood from flowing backward as it moves through the heart.
The correct answers are:
Viruses are bundles of genetic material enclosed in a capsid.<span>
</span>Viruses are not living, so D is incorrect.
Viruses are much smaller than bacteria, so A is incorrect.
Explanation:
uneven heating of Earth's surface. warm air sinking while cold air rises
Uracil is RNA base that pairs with adenine in DNA.
All living things have cells and can reproduce either asexually or sexually