Like Geography, climate, times and environment system
it'll get very dense and pull together with Gravity to eventually make a star.
Qualitative deals w/ colors, formation of gas, observable traits
quantitative is measurable like the heights of items (meters, km, miles)
Answer:
antigens
Explanation:
Specific immune responses are triggered by antigens. Antigens are usually found on the surface of pathogens and are unique to that particular pathogen. The immune system responds to antigens by producing cells that directly attack the pathogen, or by producing special proteins called antibodies.
