To keep the species from dying off.
After reaching North America, humans migrated to South America.
Hypothesis: An educated guess on the natural world possibilities
Theory: An explanation of the natural world aspect
Law: An aspect of how the natural world reacts under a specific circumstance
Hypotheses, theories, and laws all have natural world tests in common. Each of them are trying to provide the steps to guarantee a valid experimentation. You cannot have a valid experimentation without each of these. However, fact is also a need.
Water pollution affects marine ecosystems by completely killing it off. Pollution kills fish, reefs, and other underwater life. With this pollution, animal's behaviors can change, and habitats are destroyed.
I hope this helped, and I hope you pass your assessment!
Answer:
Second option
Explanation:
Add ehole numbers then add the fractions but dont add the 8 so 6/8 then simplify its now 7 3/8
