The embryonic period begins with and lasts for weeks.
fertilization; three
implantati...
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Health, 23.06.2019 04:00
What is the main structural difference between enveloped and nonenveloped viruses? a) enveloped viruses have their genetic material enclosed by a layer made only of protein.b) nonenveloped viruses have only a phospholipid membrane, while enveloped viruses have two membranes, the other one being a protein capsid.c) enveloped viruses have a phospholipid membrane outside their capsid, whereas nonenveloped viruses do not have a phospholipid membrane.d) both types of viruses have a capsid and phospholipid membrane; but in the nonenveloped virus the genetic material is between these two membranes, while in the enveloped virus the genetic material is inside both membranes.
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Health, 23.06.2019 09:30
The age of receding pandemics is one of three progessive ages of epidemiologic transition. select one: true false
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