3. describe how the relative proportion of hydrogen, helium, and heavier elements will change as the sun ages. 4. how does energy release from the sun reach earth? how does the sun's energy interact with earth's atmosphere and hydrosphere? 5. every star starts with an initial mass of hydrogen. each atom of hydrogen has one proton and one neutron. how are the total number of protons and neutrons conserved as a star ages and undergoes continuous nucleosynthesis? 6. what mechanisms or events are needed for a star to make heavier elements than iron? 7. how do scientists use electromagnetic emissions of stars to determine their composition, age, and stage of development?

lunar landing mission. apollo 11 was the first manned mission to land on the moon. the first steps by humans on another planetary body were taken by neil armstrong and buzz aldrin on july 20, 1969. the astronauts also returned to earth the first samples from another planetary body.

explanation:

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these macromolecules could either be amino acids, proteins or nucleic acids. they are responsible for the chemical changes and reactions that affects largely the cell and its composition. take for instance the cytoplasm of the cell where these organelles are settled. these simple organelles are composed of macromolecules which ignites and catalyses different functions that enables cells, in macro-perspective in motion and metabolism. in intestines for example, metabolism happens and breaking down parts of a food to simpler compounds that are used and these nutrients delivered throughout the body and again broken down by into smaller components.