Answer:
Plants produce oxygen during photosynthesis, and they also need oxygen gas from the air for cellular respiration
Explanation:
Immediately, the pathogen has been recognized:
Macrophages acts as the first line of defence by engulfing pathogens identified by antigens which will now present the antibody shape to a helper T cell.
The Helper T cells produce a signal to plasma and Memory B cells to yield antibodies that attach to the antigens. The cytotoxic cells that leads to cell death are activated by the helper T cells.
Antibodies helps to immobilize pathogen for macrophage to feed on.
if the pathogen comes back a 2nd time the memory cells helps in quick and efficient recovery by producing the specific B and T cells for the antigen.
C. esophagus. it does not secrete any enzymes. its just do peristalsis. which is a rhythmic contractions and relaxations of muscles to push food along the gut
They need lots of lift to fly (so like wind) and they need to go at a certain speed to maintain flying.
