The answer is B. Humans destroy natural ecosystems for homes and industries.
Answer:
Maybe sunlight? There's not that much context to go with this question
Answer:
The correct answer is A) Replicability.
Explanation:
The principle of replicability states that the results obtained by a researcher, in certain investigation work, have to be the same for other researchers who are following the same steps. If the experiment cannot replicate under the same conditions, then it's not valid to the scientific community and therefore cannot be published.
The menstrual<span> cycle </span>occurs<span> due to the rise and fall of hormones</span>
The sequence of impulse through the cardiac conduction system starts from SA node passes to AV node to atrioventricular bundle fibers and finally to Purkinje fibers.
Heart is an organ that receives oxygenated blood form lungs and deoxygenated blood from different parts of body. Oxygenated blood is transported to different organs and deoxygenated blood is transported to lungs for oxygenation.
Now, to perform this transportation, the auricles and ventricles of heart contract and relax. In order to contract and relax, impulse generation is required, which begins at SA node or Sinoatrial node. It is also referred to as pacemaker of the heart. SA node contracts the atria and the impulse transfers to AV node or Atrioventricular node.
This is followed by transfer of impulse to atrioventricular bundle fibers which further passes it on to Purkinje fibres for ventricular contraction. Now the blood is sent to lungs and aorta as per it's oxygen status.
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