B . Locard’s principle of exchange.
Answer:
B. Their cells have a nucleus.
Explanation:
Protists are eukaryotes, which means their cells have a nucleus and other membrane-bound organelles. Most, but not all, protists are single-celled.
The answer is [ D ] According to me
Answer:
People, because we cause pollution and global warming.
Explanation:
It is chemical because of the heat and gas which causes air bubbles