1. SI,
2. Number 10.
I'm pretty sure it's that, I just did something related to that.
Answer: Diffusion occurs due to the random movement of particles. It usually happens due to a concentration gradient, meaning that molecules move from an area of high concentration to an area of lower concentration.
Explanation:
The fossils that provide information on the formation of an oxygen-rich atmosphere are the stromatilites from the Precambrian era. These are layered and columnar fossils consisting mainly of cyanobacteria which were the original life form back then. These bacteria took in carbon dioxide and produced oxygen by photosynthesis as early as 2.5 billion years ago (the earth is about 4.5 billion yrs old).
<span>How does a hypothesis help scientists understand the natural world?</span>
By performing controlled experiment that are tested by gathering more data based on observations
Hope This Helps! :3
