Heat increases. Smoke is hot, and as long as you have a cooler air Gulf to the burning substances, then the smoke will rise.<span>
Happy studying ^-^</span>
Because an antibody is "made" relative to the antigen, but kept at low levels when you are exposed the first time ("primary immune response"). The second time you're exposed to the same antigen, memory cells recognize it and the body produces a high level of antibodies, and the level of antibodies usually remains higher for a longer time ("secondary immune response"). This is your basic immune response (primary and secondary).
This explains exactly why vaccines are effective to extremely effective.
<span>The bone with insufficient or abnormal collagen would fracture easily compared with a healthy bone. Collagen is the most abundant protein in our bodies , and is found in muscles, bones, skin , blood vessels, digestive system and tendons. Collagen provides integrity, firmness and elasticity to their structures, such as bones. Therefore a healthy bone has high integrity and firmness and thus can resist fractures and other mechanical damages.</span>
Answer:
Mouth: site where mechanical digestion takes place
Stomach: A mixture of chemical etc...
Esophagus: At this site, muscles are contracted to falicilitate peristalsis
I believe the answer would be B I think sorry in advance if im incorrect
