Answer:
complement is a system of plasma protiens that can be activated directly by pathogens
The substance must be able to alter its physical characteristic (for example, its color) in accordance to a change in pH. One example of this is litmus paper, which becomes red under acidic conditions and blue under basic conditions.
Some organisms may be very closely related, even though a minor genetic change caused a major morphological difference to make them look quite different. For example, chimpanzees and humans, the skulls of which are shown in Figure 12.2. 2 are very similar genetically, sharing 99 percent1 of their genes. Hope this helps! Mark brainly please!
