One of the major differences between the first and second line of defense is that a. the first line defenses are anatomical barriers whereas the second line defenses are mechanisms.
b. the first line defenses involve complement proteins whereas the second line defenses involve antibodies.
c. the first line defenses involve the respiratory tract whereas the second line defenses involve the gastrointestinal tract.
d. the first line defenses are mechanisms whereas the second line defenses are physical barriers to infection.

when it is at an intermediate population density

i think the answer is 95 hope this

the potatoes have high sugar concentrations and although these potatoes were different we could seethe effects that their sugar concentrations had in different environments. for example, the potatoes in sample a, were placed in pure water. this created a hypertonic environment and caused the potatoes to draw in water from its surroundings. we saw the opposite happen with the potatoes in sample b when placed in the sodium chloride solution. the potatoes in this case were in a hypotonic solution and therefore lost water to their surroundings.