Answer:
I believe its a heart attack.
Explanation:
Heart attack: A sudden blockage of the coronary arteries causes scarring in the heart's tissues and decreases how effectively it can pump.
Answer:
circulate blood around the body via the heart, arteries an veins, etc
Explanation:
Because of the constantly shifting air pressures
Answer:
The population of fish with pelvic spines that arrived in the lake at time B evolved a reduced pelvis over time (beginning at time C).
(Having a reduced pelvis must have been advantageous for this ancient stickleback population, just as it is for many current freshwater stickleback populations.)
Antibiotics damage bacteria by inhibiting their ability to function.
