<span>They have various isomer structures often either open chain or cyclic isomers that readily interchange structures. </span>
Answer:
their fins or webbled feet hels them to move and search food to eat .
a - fossil fuels
step by step explanation:
fossil fuels are non-renewable and will run out
Answer:
Earth's atmosphere is composed of about 78 percent nitrogen, 21 percent oxygen, 0.9 percent argon, and 0.1 percent other gases. Trace amounts of carbon dioxide, methane, water vapor, and neon are some of the other gases that make up the remaining 0.1 percent.
Explanation:
A verticle group (up and down) is called a GROUP. The horizontal groups (left to right) are called PERIODS
