I think it is A. but then you can also produce your own energy
I’m not sure if you want some ideas but like if you go then eye colour hair colour and then genders?
Answer:
I reckon towards b. Let me know if im right
I do not agree with the statement.
The "substance" can be a compound. It's "pure"
as long as there's nothing else in it but its name.
'Pure' water is 100% H₂O with nothing else in it.
'Pure' table salt is 100% NaCl with nothing else in it.
'Pure' carbon dioxide is 100% CO₂ with nothing else in it.
These example substances are all compounds, not elements.
I would say the last option, since with an increase in temperature, water molecules will speed up.
