Can u give me a choice besides a, and I don’t understand what a represents
There might not be enough oxygen for us to survive. As the plants and animals circulate the flow of oxygen and carbon, it wouldn’t be enough. Say you were trapped in a vacuum (not the one you use to clean your house). You would have only enough oxygen in your lungs to last you for a little while, but then there is too much carbon in the air that we exhale. Plants and animals use that carbon to release oxygen. So, without them, earth would be filled with carbon
Answer:
OMG Hope this helps
Explanation:
U.S. citizens must comply with certain mandatory obligations, including:
Obeying the law. Every U.S. citizen must obey federal, state and local laws, and pay the penalties that can be incurred when a law is broken.
Paying taxes. ...
Serving on a jury when summoned. ...
Registering with the Selective Service.
Answer:
Other European countries sent explorers to claim land in the New World.
