Either C or D but I pretty sure it's C
Answer:
A vaccine works by training the immune system to recognize and combat pathogens, either viruses or bacteria. To do this, certain molecules from the pathogen must be introduced into the body to trigger an immune response. These molecules are called antigens, and they are present on all viruses and bacteria
Explanation:
Answer:
i cant see the questions please send me again
natural selection and common descent are the 2 ideas Darwin used to explain evolution
Solid. it's all stuck and linked together, while liquids are flowing along and gases fly around wherever they please. Hope this helps
