SOMEONE PLSSS HELPP ME In a laboratory, you produce a quantity of the radioactive isotope unobtainium-253. Over the course of several weeks, the unstable isotope decays, and you measure the amount of unobtainium-253 remaining in the sample. You obtain the following data:
The half-life of unobtainium-253 is _Incorrect. days.

After 2 half-lives, there will be _Incorrect. grams of unobtainium-253 remaining in this sample.

After _Incorrect. days, there will be 1.5 grams of unobtainium-253 remaining in this sample.

well, you see. the answer to your question is quite simple. the thing that is big, powerful, and over 9,000 is your mom.

answer: accepted answer: aquatic animals use the oxygen dissolved in water to carry out respiration. since the amount of dissolved oxygen in water is low as compared to the amount of oxygen in the air, therefore the rate of breathing in aquatic animals is much faster than it is in terrestrial animals.

explanation:

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.