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>
B. larger and more complex
Explanation: As the environment became more unpredictable, bigger brains helped our ancestors survive.
I'd say, ina general way, that the most imporant cells in defense against parasitic organisms are definitely white blood cels, the cells responsible for defeating antigens, pathogens and deseases.
Although these might be the most important ones in that specific task (defending against parasitic organisms), all the cells in the immune system, along with other non-cell things are important, since they all play a specific role indispensable in our immune system.
Hope it helped,
BioTeacher101
