Oxygen-poor blood enters the heart through the right atrium. From there blood flows through the tricuspid valve into the right ventricle. When the heart contracts during the diastolic phase, this blood is pumped out through the pulmonary arteries that run toward the lungs. At the lungs, the blood is circulated through a series of progressively smaller arterioles until it flows through capillaries lining the lungs' alveolar sacs. It is here that gas exchange takes place as oxygen is taken up by the blood, and carbon dioxide is released into the waste air.After oxygenation, the fresh blood is circulated back through the bronchial veins and into the pulmonary veins. These run from the lungs and drain into the heart's left atrium. During the systolic phase of the heartbeat, the mitral valve under the left atrium opens and permits blood to pass into the left ventricle. This chamber is heavily muscled and it has the power to pump the oxygen-rich blood out through the aorta and into the rest of the body.
It may cause mutations; Artificial selection is the process of unintentional modification of a species through human actions which encourage the breeding of certain traits over others. Some disadvantages of artificial selection is that it is inhumane, can cause mutations or produce new problems. Hope it helps :D
Answer:
a cell takes in DNA from outside the cell then the external DNA becomes a component of the cell's DNA.
Explanation:
Explanation:
Bengal tiger
<em>Bengal </em><em>tiger </em><em>is </em><em>one </em><em>of </em><em>the </em><em>five </em><em>species </em><em>in </em><em>the </em><em>world</em><em>. </em><em> </em><em>Bengal</em><em> </em><em>Tiger </em><em>has </em><em>orange </em><em>coat </em><em>with </em><em>black </em><em>stripes </em><em>in </em><em>its </em><em>body </em><em>and </em><em>white </em><em>undersides</em><em>.</em><em> </em><em>It </em><em>has </em><em>long </em><em>banded </em><em>tail</em><em>. </em><em> </em><em>It </em><em>is </em><em>the </em><em>largest </em><em>among </em><em>the </em><em>tigers</em><em>. </em><em>It's </em><em>scientific </em><em>name </em><em>is </em><em>P</em><em>anthera</em><em> </em><em> </em><em>Tigris</em><em>.</em>
<em>Age </em><em>of </em><em>tigers </em><em>at </em><em>first </em><em>reproductive </em><em>is</em><em> </em><em>three </em><em>years </em><em>and </em><em>females </em><em>produce </em><em>a </em><em>little </em><em>of </em><em>two </em><em>to </em><em>five </em><em>cubs </em><em>after </em><em>a </em><em>gestation </em><em>of </em><em>1</em><em>0</em><em>3</em><em> </em><em>days</em><em>. </em><em> </em><em>The </em><em>overall </em><em>lifespan </em><em>of </em><em>a </em><em>Bengal </em><em>Tiger </em><em>can </em><em>be </em><em>up-to </em><em>2</em><em>0</em><em> </em><em>years</em><em>. </em>
<em>Hope </em><em>it </em><em>will </em><em>help </em><em>:</em><em>)</em><em>❤</em>
Answer:
Single-cell organisms
Explanation:
In 1735, Linnaeus introduced a classification system with only two kingdoms: animals and plants. Linnaeus published this system for naming, ranking, and classifying organisms in the book "Systema Naturae". In the epoch that Linnaeus created this system, single-cell organisms such as bacteria and protists were almost unknown. In 1866, E. Haeckel added a category including both bacteria and protozoa, thereby adding a category formed by single-cell organisms (different from animals and plants). During the 1900-1920 period, bacteria were classified as a separated kingdom named 'prokaryotes'. The current three-domain classification system was introduced by C. Woese in 1990. In this system, all forms of life are divided into three different domains: archaea, bacteria, and eukaryote domains (this last composed of protists, fungi, plants and animals).
