When two atoms of different elements come in contact, heat is given off and light is produced. which of the following does this support?

a. the law of definite proportions
b. the law of conservation of energy
c. dalton's atomic theory
d. the law of conservation of matter

Idon’t know the answer and i’ve been stuck on it for a while now skskskskks

The double bond between a carbon atom and two oxygen atoms (a molecule of carbon dioxide) has two characteristics. what are they? a. an ionic bond is formed between the oxygen and carbon atoms. b. four valence electrons are shared. c. two valence electrons are shared. d. valence electrons are shared between oxygen atoms.

Can a trait be both polygenic and have multiple alleles? explain why or why not.