The correct demonstrative adjective for this sentences would be "este".
* Este niño en la foto es mi primo Francisco". Because "ESTE" refers to a singular male subject. If it would have been a girl, the correct option would have been "ESTA". For plurals we need to use "estos" and "esa" when it is a singular, female and we point the subject at a certain distance. "Esa es mi prima" --> That is my cousin (over there)
<u>Answer</u>
<em>According to NCSU, Developing a new vaccine from scratch takes considerable time. It depends a lot on how much information is available about the disease itself, how the disease infects people and spreads, and so on. But it traditionally has taken 5-10 years to get a new vaccine.</em>
<em>In my opinion, it depends. This means that it could take as little time or a long time. In general, it would take some time, but not much to this day. It would most likely take lots of years for </em><u><em>everyone in the world</em></u><em> to get the vaccines though.</em>
<em>#TeamTrees</em>
<em>Hope this helps! <3</em>
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