All viruses have a <span>capsid, that contains there DNA or RNA, never both. </span>
No organism is always the first step, except in a wide sense, plants. In the water, plankton is found in first but whereas on land, plants or seeds are eaten first.
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No, you cannot.
25% of 1600 is 400
1600-400=1200
when you take your remaining income and subtract your expenses, you are left with no left over money.