Explanation:
mass is a weight ofan object .
A tree is considered living because it takes in nutrients like other living things. The tree is also made up of cells which all living things are made up of. Trees can also produce offspring. Just like any other living thing.
B. DNA replication is the most similar to PCR
Maybe because of global warming and the glacier water melting makING it bigger and deeper. (I hope this is the answer you are looking for)