Answer:
D dangerous organisms
Explanation:
i’m almost 100% positive if not then it’s probably A global warming
Answer: past
Explanation: answers show that combonations can develope things
Compounds are made up of elements.
Elements are the ones we pull straight out from the periodic table.
For example:
H2O, HCl, NaCl, NaOH --> these are all compounds
H, N, B, Ne, Na, Cl, O, K --> these are all elements.
