"odd">
<td align="left">trophic_lvl</td>
<td align="left">heterotroph, autotroph</td>
</tr>
<tr class="even">
<td align="left">habitat</td>
<td align="left">freshwater, terrestrial, marine</td>
</tr>
<tr class="odd">
<td align="left">region</td>
<td align="left">america_north, europe, america_south</td>
</tr>
<tr class="even">
<td align="left">ecotox_grp</td>
<td align="left">invertebrate, plant, fungi</td>
</tr>
<tr class="odd">
<td align="left">duration</td>
<td align="left">24, 96</td>
</tr>
<tr class="e