What was the starting point for large atoms like those in lead, gold, and other metals heavier than iron? When large stars got old, collapsed, and exploded.
None of these events can explain the formation of heavy metals.
When smaller elements fused in the cores of young stars.
When subatomic particles came together to make the first atoms soon after the Big Bang.

This is a typical grassland food web. it is also a small picture of an important cycle on earth: the carbon cycle. describe how the carbon gets into this food web. a) bacteria and fungi, the decomposers, recycle carbon from dead organisms. b) carbon is found in the grass and is passed from one level to the next in this food web. eliminate c) all living things give off carbon dioxide as a by-product of respiration and it is released into the atmosphere. d) plants use carbon dioxide as a reactant in photosynthesis, to make usable chemical energy in the form of a sugar.