A certain element X has 3 isotopes. Their masses and abundances are as follows X-25 has an abundance of 57.43%. X-26 has an abundance of
22.37%. X-28 has an abundance of 20.20%. What is the atomic mass of X?
Round your answer to the nearest hundredth.

Most likely a is the answer - because  you generate   38 atp's but also consume an atp.   each atp gives approx. less than 4 kcal so probably a is the closest answer.

Mass is the amount of matter in an object.  weight is the measurement of the pull of gravity on an object.  say for example, you travel to the moon which has a different gravitational field compared to the gravitational field of earth. (gravitational fields: earth = 1, moon = 0.165)  now when you are on the moon, the pull of gravity on you is different than on the earth. and as weight is the measurement of the pull of gravity on an object, that means yes, your weight can and will change on the moon.  however, on the moon, on earth or even on jupiter, the amount of mass inside of you remains the same. meaning your physical mass remains constant.  in conclusion it is possible for your weight to change as your mass remains constant. 

The answer is b because c don't explain why the moths are on them and it isn't a because as we know only one species of moth does this