You would want this observation to be in an area with a lot of biotic and abiotic factors, so the best place for it is an ecosystem.
Answer:
a. bubbles formed
Explanation:
Bubbles are a sign of gaseous molecules escaping, meaning that something has forced molecules to break apart and escape. A chemical reaction involves any change that directly impacts the molecular formation of a substance.
Answer: papillary muscle
Chordae tendinae is a connective tissue that used to prevent the heart valve to be flapped away. It like a string that connected into the valve and makes it look like a kite. Papillary muscle is the part that anchoring it to the heart wall.
The answer are plants im sure
