Scientists around the world have been working for decades on perfecting the process of nuclear fusion in the lab. which statement justifies this research?

scientists are looking for a way to generate an unlimited source of hydrogen.
scientists are looking for a way to absorb the energy produced by nuclear bombs.
scientists are looking for a way to produce the uncommon noble gas helium.
scientists are looking for a way to create cheap, safe, and sustainable energy.

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.

the correct answer is b. possesses the characteristic of compartmentalization of organelles, wherein the organelles are bound by membranes.

explanation: