Do neutrons make up a part of the atoms mass?

they deliver oxygen to the blood

i think it is d. objects resist changes in their state of motion.

occluded front i think

i think i can answer even without the example. over time with environmental changes, sometimes a group of animals will adapt to better survive. take a moth for example. if the trees the moths use to camouflage themselves from predators, started to die or change colors themselves, the moths may, overtime of course, change color too. its just adapting to its surroundings. hope i was of any : )