Scientific theories are often so powerful because they have been tested several time by different peoples and they have been found to be true. A scientific theory is a well substantiated explanation for a specific phenomenon which has undergone many observations and experiments and has stand the test of time. Thus, scientific theories always have to be reckon with because they have been severally tested.
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There are a number of different methods employed including clot-based coagulation tests, chromogenic assays, immunological tests, and aggregation studies. Today automated machines are designed to be able to perform a number of different methodologies.
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Their bodies are made for that temp and climate and landscape
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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.
Answer: fix the grammar. Subject/verb agreement needed
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