Hello!
I believe the best answer to your question would be Option C) excess carbon dioxide.
Hope this helps, and have a lovely rest of your day :)
The first evidence of modern human traits, including increasing brain size and dependence on material culture shows up in Homo habilis. Even though they are species<span> of genus </span>Homo, they are not similar to people nowadays at all. <span>In </span>palaeoanthropology, these species were the first ones who left Africa and started to move and spread along Eurasia, which is one the main facts and characteristics of Homo habilis.
They are not able to reproduce independently
They do not use energy for metabolism of any kind
<span>Their virulence is maintained by non-living cultures
Hope this helps. ^.^</span>
C. Mammary gland. Hope this helps!
None...........................probably mars
