Which sentences describe ponds and lakes?
these are water bodies formed from melting glaciers. however, their size can vary from a few square meters to thousands of square kilometers. these regions form where freshwater streams or rivers merge with the ocean. they can be seasonal, existing for a few months, or exist for hundreds of years or more. you can find algae, fishes, sea urchins, octopuses, and starfish in them.

" However, their size can vary from a few square meters to thousands of square kilometers."

"They can be seasonal, existing for a few months, or exist for hundreds of years or more. "

Explanation:

the first sentence is incorrect, many places that don't even get snow or cold weather have ponds and lakes. You wont find sea urchins, octopuses or starfish in ponds and lakes. Many lakes are not connected to the ocean.

" However, their size can vary from a few square meters to thousands of square kilometers."

"They can be seasonal, existing for a few months, or exist for hundreds of years or more. "-

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.