Answer:
Ion i think
Explanation:
I think ion's contain more negative energy from electrons and since it's -18 and 9+ it would be -9 if u add them up
The fifth week of pregnancy.
The individual who did not receive the same credit as Darwin was Alfred Russel Wallace.
<h3>What is the evolution theory?</h3>
The evolution theory is a scientific theory explaining how natural selection may change (evolve) phenotypes across generations.
Alfred Russel Wallace was an evolutionary biologist who understood the importance of natural selection on this process.
In conclusion, Alfred Russel Wallace did not receive the credit as Darwin.
Learn more about natural selection here:
brainly.com/question/23929271
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If want a direct answer it would be the decrease in mice, but if you want to get technical the decrease in grain spills caused mice to leave so that would be the indirect cause