Here is a diagram showing the process of natural selection: https://bioteaching.files.wordpress.com/2012/03/img1.jpg

Molds. Molds such as Plasmodial Slime that may grow on wood after a period of rainy weather. Molds are a type of protists. This is a link to what it looks like. http://img1.photographersdirect.com/img/21394/wm/pd1527513.jpg

Create images the same size, then place into a table with two cells:

<table style="width: 100%">

<tr>

<td style="width:50%"><img src="/images/img1.jpg"/></td>

<td style="width:50%"><img src="/images/img2.jpg"/></td>

</tr>

</table>

http://www.latinastereo.com/library/images/genteLatina/salsero/hectorLavoe/image02.jpg

It depends on your file system. Some filesystems are CASE sensitive but typically JPG and jpg are the same thing.