Answer:
Fossils are formed through preservation: Freezing.
Explanation:
Ice and low temperatures keep organisms from decaying. Large mammals have been found buried in ice, probably caused by earthquakes and avalanches, in Siberia and Alaska.
Answer:
chemical change
Explanation: the acid in your stomach changes the food you swallowed into sum else and you cant reverse it, think of it like toasting bread, once it's toasted you cant turn it back to regular bread
Answer:
The frogs circulatory and digestive systems are physically connected because the frog’s digestive system includes its liver and this has a hepatic portal system through which veins pass and come out and that is the circulatory system so they are connected.